Patent Law FAQ
This FAQ answers all your questions about patent law, patent procedure, and the patent examination process.
MPEP 2100 – Patentability (3)
Product-by-process claims and method claims are distinct types of patent claims with different scopes and considerations:
- Product-by-process claims are directed to the product itself, defined by the process used to make it. The patentability is based on the product, not the process.
- Method claims are directed to the process or steps used to make a product or achieve a result.
According to MPEP 2113:
“The structure implied by the process steps should be considered when assessing the patentability of product-by-process claims over the prior art.”
Key differences include:
- Focus: Product-by-process claims focus on the end product; method claims focus on the process steps.
- Infringement: Product-by-process claims are infringed by identical products, regardless of how they’re made; method claims are infringed only when the specific steps are performed.
- Examination: Product-by-process claims are examined based on the product structure; method claims are examined based on the specific steps and their order.
Understanding these differences is crucial for proper claim drafting and patent strategy.
To learn more:
While “use” claims are generally problematic in US patent applications, there are rare instances where they might be acceptable:
- Certain process claims: If the claim clearly implies the steps involved, it might be considered definite. However, this is risky and not recommended.
- Product-by-process claims: These are not strictly “use” claims but can describe a product in terms of the process used to make it.
The MPEP 2173.05(q) states: “Ex parte Dunki, 153 USPQ 678 (Bd. App. 1967) held the following claim to be an improper definition of a process: ‘The use of a high carbon austenitic iron alloy having a proportion of free carbon as a vehicle brake part subject to stress by sliding friction.’ In Clinical Products Ltd. v. Brenner, 255 F. Supp. 131, 149 USPQ 475 (D.D.C. 1966), the following claim was held definite and proper: ‘The use of a sustained release therapeutic agent in the body of ephedrine absorbed upon polystyrene sulfonic acid.’“
Despite these exceptions, it’s generally safer and more effective to draft claims as method or product claims to avoid potential indefiniteness rejections under 35 U.S.C. 112(b).
To learn more:
In product-by-process claim rejections, the burden of proof is initially on the patent examiner, but it’s lower than for conventional product claims. According to MPEP 2113:
“The Patent Office bears a lesser burden of proof in making out a case of prima facie obviousness for product-by-process claims because of their peculiar nature” than when a product is claimed in the conventional fashion.
Once the examiner provides a rationale showing that the claimed product appears to be the same or similar to a prior art product, the burden shifts to the applicant. The applicant must then provide evidence establishing a nonobvious difference between the claimed product and the prior art product.
To learn more:
MPEP 2113 – Product – By – Process Claims (2)
Product-by-process claims and method claims are distinct types of patent claims with different scopes and considerations:
- Product-by-process claims are directed to the product itself, defined by the process used to make it. The patentability is based on the product, not the process.
- Method claims are directed to the process or steps used to make a product or achieve a result.
According to MPEP 2113:
“The structure implied by the process steps should be considered when assessing the patentability of product-by-process claims over the prior art.”
Key differences include:
- Focus: Product-by-process claims focus on the end product; method claims focus on the process steps.
- Infringement: Product-by-process claims are infringed by identical products, regardless of how they’re made; method claims are infringed only when the specific steps are performed.
- Examination: Product-by-process claims are examined based on the product structure; method claims are examined based on the specific steps and their order.
Understanding these differences is crucial for proper claim drafting and patent strategy.
To learn more:
In product-by-process claim rejections, the burden of proof is initially on the patent examiner, but it’s lower than for conventional product claims. According to MPEP 2113:
“The Patent Office bears a lesser burden of proof in making out a case of prima facie obviousness for product-by-process claims because of their peculiar nature” than when a product is claimed in the conventional fashion.
Once the examiner provides a rationale showing that the claimed product appears to be the same or similar to a prior art product, the burden shifts to the applicant. The applicant must then provide evidence establishing a nonobvious difference between the claimed product and the prior art product.
To learn more:
MPEP 2173.05(Q) – "Use" Claims (1)
While “use” claims are generally problematic in US patent applications, there are rare instances where they might be acceptable:
- Certain process claims: If the claim clearly implies the steps involved, it might be considered definite. However, this is risky and not recommended.
- Product-by-process claims: These are not strictly “use” claims but can describe a product in terms of the process used to make it.
The MPEP 2173.05(q) states: “Ex parte Dunki, 153 USPQ 678 (Bd. App. 1967) held the following claim to be an improper definition of a process: ‘The use of a high carbon austenitic iron alloy having a proportion of free carbon as a vehicle brake part subject to stress by sliding friction.’ In Clinical Products Ltd. v. Brenner, 255 F. Supp. 131, 149 USPQ 475 (D.D.C. 1966), the following claim was held definite and proper: ‘The use of a sustained release therapeutic agent in the body of ephedrine absorbed upon polystyrene sulfonic acid.’“
Despite these exceptions, it’s generally safer and more effective to draft claims as method or product claims to avoid potential indefiniteness rejections under 35 U.S.C. 112(b).
To learn more:
Patent Law (3)
Product-by-process claims and method claims are distinct types of patent claims with different scopes and considerations:
- Product-by-process claims are directed to the product itself, defined by the process used to make it. The patentability is based on the product, not the process.
- Method claims are directed to the process or steps used to make a product or achieve a result.
According to MPEP 2113:
“The structure implied by the process steps should be considered when assessing the patentability of product-by-process claims over the prior art.”
Key differences include:
- Focus: Product-by-process claims focus on the end product; method claims focus on the process steps.
- Infringement: Product-by-process claims are infringed by identical products, regardless of how they’re made; method claims are infringed only when the specific steps are performed.
- Examination: Product-by-process claims are examined based on the product structure; method claims are examined based on the specific steps and their order.
Understanding these differences is crucial for proper claim drafting and patent strategy.
To learn more:
While “use” claims are generally problematic in US patent applications, there are rare instances where they might be acceptable:
- Certain process claims: If the claim clearly implies the steps involved, it might be considered definite. However, this is risky and not recommended.
- Product-by-process claims: These are not strictly “use” claims but can describe a product in terms of the process used to make it.
The MPEP 2173.05(q) states: “Ex parte Dunki, 153 USPQ 678 (Bd. App. 1967) held the following claim to be an improper definition of a process: ‘The use of a high carbon austenitic iron alloy having a proportion of free carbon as a vehicle brake part subject to stress by sliding friction.’ In Clinical Products Ltd. v. Brenner, 255 F. Supp. 131, 149 USPQ 475 (D.D.C. 1966), the following claim was held definite and proper: ‘The use of a sustained release therapeutic agent in the body of ephedrine absorbed upon polystyrene sulfonic acid.’“
Despite these exceptions, it’s generally safer and more effective to draft claims as method or product claims to avoid potential indefiniteness rejections under 35 U.S.C. 112(b).
To learn more:
In product-by-process claim rejections, the burden of proof is initially on the patent examiner, but it’s lower than for conventional product claims. According to MPEP 2113:
“The Patent Office bears a lesser burden of proof in making out a case of prima facie obviousness for product-by-process claims because of their peculiar nature” than when a product is claimed in the conventional fashion.
Once the examiner provides a rationale showing that the claimed product appears to be the same or similar to a prior art product, the burden shifts to the applicant. The applicant must then provide evidence establishing a nonobvious difference between the claimed product and the prior art product.
To learn more:
Patent Procedure (3)
Product-by-process claims and method claims are distinct types of patent claims with different scopes and considerations:
- Product-by-process claims are directed to the product itself, defined by the process used to make it. The patentability is based on the product, not the process.
- Method claims are directed to the process or steps used to make a product or achieve a result.
According to MPEP 2113:
“The structure implied by the process steps should be considered when assessing the patentability of product-by-process claims over the prior art.”
Key differences include:
- Focus: Product-by-process claims focus on the end product; method claims focus on the process steps.
- Infringement: Product-by-process claims are infringed by identical products, regardless of how they’re made; method claims are infringed only when the specific steps are performed.
- Examination: Product-by-process claims are examined based on the product structure; method claims are examined based on the specific steps and their order.
Understanding these differences is crucial for proper claim drafting and patent strategy.
To learn more:
While “use” claims are generally problematic in US patent applications, there are rare instances where they might be acceptable:
- Certain process claims: If the claim clearly implies the steps involved, it might be considered definite. However, this is risky and not recommended.
- Product-by-process claims: These are not strictly “use” claims but can describe a product in terms of the process used to make it.
The MPEP 2173.05(q) states: “Ex parte Dunki, 153 USPQ 678 (Bd. App. 1967) held the following claim to be an improper definition of a process: ‘The use of a high carbon austenitic iron alloy having a proportion of free carbon as a vehicle brake part subject to stress by sliding friction.’ In Clinical Products Ltd. v. Brenner, 255 F. Supp. 131, 149 USPQ 475 (D.D.C. 1966), the following claim was held definite and proper: ‘The use of a sustained release therapeutic agent in the body of ephedrine absorbed upon polystyrene sulfonic acid.’“
Despite these exceptions, it’s generally safer and more effective to draft claims as method or product claims to avoid potential indefiniteness rejections under 35 U.S.C. 112(b).
To learn more:
In product-by-process claim rejections, the burden of proof is initially on the patent examiner, but it’s lower than for conventional product claims. According to MPEP 2113:
“The Patent Office bears a lesser burden of proof in making out a case of prima facie obviousness for product-by-process claims because of their peculiar nature” than when a product is claimed in the conventional fashion.
Once the examiner provides a rationale showing that the claimed product appears to be the same or similar to a prior art product, the burden shifts to the applicant. The applicant must then provide evidence establishing a nonobvious difference between the claimed product and the prior art product.
To learn more: