MPEP § 2259 — Res Judicata and Collateral Estoppel in Reexamination Proceedings (Annotated Rules)

§2259 Res Judicata and Collateral Estoppel in Reexamination Proceedings

USPTO MPEP version: BlueIron's Update: 2025-12-31

This page consolidates and annotates all enforceable requirements under MPEP § 2259, including statutory authority, regulatory rules, examiner guidance, and practice notes. It is provided as guidance, with links to the ground truth sources. This is information only, it is not legal advice.

Res Judicata and Collateral Estoppel in Reexamination Proceedings

This section addresses Res Judicata and Collateral Estoppel in Reexamination Proceedings. Primary authority: 35 U.S.C. 2286. Contains: 2 permissions and 6 other statements.

Key Rules

Topic

Ex Parte Reexamination

3 rules
MPEP GuidanceInformativeAlways
[mpep-2259-7ce8a2dd2da0ff8f141579c7]
Claims Finally Held Invalid Cannot Be Reexamined
Note:
Claims that are finally held invalid by a federal court and through all appeals cannot be reexamined in future proceedings.

Claims finally held invalid by a federal court, after all appeals, will be withdrawn from consideration and not reexamined during a reexamination proceeding. A rejection on the grounds of res judicata will not be appropriate in reexamination. However, if the claims in a reexamination proceeding present the same issue(s) as claims that were finally held invalid by a federal court in a proceeding involving a different patent in the same patent family, collateral estoppel may apply if the patentee had a full and fair opportunity to litigate that issue in federal court. See In re Arunachalam, 709 Fed. Appx. 699 (Fed. Cir. 2017)(nonprecedential).

Jump to MPEP SourceEx Parte Reexamination
MPEP GuidancePermittedAlways
[mpep-2259-6facd101d0a68c4b80bb31a2]
Collateral Estoppel May Apply In Reexamination
Note:
If claims in reexamination present the same issues as invalid claims from a different patent, collateral estoppel may apply if the patentee had a full and fair opportunity to litigate.

Claims finally held invalid by a federal court, after all appeals, will be withdrawn from consideration and not reexamined during a reexamination proceeding. A rejection on the grounds of res judicata will not be appropriate in reexamination. However, if the claims in a reexamination proceeding present the same issue(s) as claims that were finally held invalid by a federal court in a proceeding involving a different patent in the same patent family, collateral estoppel may apply if the patentee had a full and fair opportunity to litigate that issue in federal court. See In re Arunachalam, 709 Fed. Appx. 699 (Fed. Cir. 2017)(nonprecedential).

Jump to MPEP SourceEx Parte Reexamination
MPEP GuidanceInformativeAlways
[mpep-2259-80b9b0c093a3bffc4ecdfb6d]
Claims Finally Held Invalid Not Reexamined
Note:
Claims that were finally held invalid by a federal court will not be reexamined in subsequent proceedings.

Claims finally held invalid by a federal court, after all appeals, will be withdrawn from consideration and not reexamined during a reexamination proceeding. A rejection on the grounds of res judicata will not be appropriate in reexamination. However, if the claims in a reexamination proceeding present the same issue(s) as claims that were finally held invalid by a federal court in a proceeding involving a different patent in the same patent family, collateral estoppel may apply if the patentee had a full and fair opportunity to litigate that issue in federal court. See In re Arunachalam, 709 Fed. Appx. 699 (Fed. Cir. 2017)(nonprecedential).

Jump to MPEP SourceEx Parte Reexamination
Topic

Estoppel After Judgment

3 rules
MPEP GuidancePermittedAlways
[mpep-2259-be96f5d52feaf0a54e1f889a]
Final Invalidity Ruling Not Barred From Reexamination
Note:
Claims finally held not invalid by a federal court may still be subject to reexamination, as res judicata does not apply in reexamination proceedings.

Claims finally held as "not invalid" by a federal court, after all appeals, may still be subject to reexamination. One of the essential elements of claim preclusion (res judicata) is the involvement of the same parties, or parties in privity with the original parties. The doctrine of res judicata based on a court holding in an infringement proceeding is not applicable in reexamination proceedings, because the Office was not a party to the litigation.

Jump to MPEP SourceEstoppel After JudgmentPTAB Contested Case Procedures
MPEP GuidanceInformativeAlways
[mpep-2259-96a903971e045a3f88299f36]
Res Judicata Requires Same Parties
Note:
The doctrine of res judicata in reexamination proceedings requires the involvement of the same parties as in the original infringement litigation.

Claims finally held as "not invalid" by a federal court, after all appeals, may still be subject to reexamination. One of the essential elements of claim preclusion (res judicata) is the involvement of the same parties, or parties in privity with the original parties. The doctrine of res judicata based on a court holding in an infringement proceeding is not applicable in reexamination proceedings, because the Office was not a party to the litigation.

Jump to MPEP SourceEstoppel After JudgmentPTAB Contested Case Procedures
MPEP GuidanceInformativeAlways
[mpep-2259-d9258cb9a254ed8d017c113e]
Office Is Not Bound by Res Judicata or Collateral Estoppel in Reexamination
Note:
The Office is not bound by res judicata or collateral estoppel when claims are reexamined if they were previously held as 'not invalid' by a federal court, due to lack of party status and full litigation opportunity.

In In re Trans Texas Holdings Corp., 498 F.3d 1290, 83 USPQ2d 1835 (Fed. Cir. 2007), the court held that issue preclusion (collateral estoppel) could not be applied against the Office based on a district court holding in an infringement proceeding, because the Office was not a party to the earlier infringement proceeding and did not have “a full and fair opportunity” to litigate the issue; See also In re Construction Equipment Company, 665 F.3d 1254, 100 USPQ2d 1922 (Fed. Cir. 2011), in which the majority did not adopt the dissent view that reexamination of claims finally held as "not invalid" by a federal court was barred by claim preclusion (res judicata) or issue preclusion (collateral estoppel).

Jump to MPEP SourceEstoppel After JudgmentPTAB Contested Case Procedures
Topic

Ex Parte Reexamination Request

1 rules
MPEP GuidanceInformativeAlways
[mpep-2259-4f4cba6ee1f2fdbee464ef81]
Policy for Reexamining Patents After Federal Court Decisions
Note:
MPEP § 2242 and § 2286 outline the Office's policy on determining reexamination requests and examining patents where federal court decisions have determined the merits.

MPEP § 2242 and § 2286 relate to the Office policy controlling the determination on a request for reexamination and the subsequent examination phase of the reexamination where there has been a federal court decision on the merits as to the patent for which reexamination is requested.

Jump to MPEP SourceEx Parte Reexamination RequestEx Parte Reexamination
Topic

PTAB Contested Case Procedures

1 rules
MPEP GuidanceInformativeAlways
[mpep-2259-6516627dbd88dccb556f67f5]
Res Judicata Not Applicable in Reexamination
Note:
A court's final holding on claim validity is not binding in reexamination proceedings because the Office was not a party to the litigation.

Claims finally held as "not invalid" by a federal court, after all appeals, may still be subject to reexamination. One of the essential elements of claim preclusion (res judicata) is the involvement of the same parties, or parties in privity with the original parties. The doctrine of res judicata based on a court holding in an infringement proceeding is not applicable in reexamination proceedings, because the Office was not a party to the litigation.

Jump to MPEP SourcePTAB Contested Case ProceduresEstoppel After Judgment

Citations

Primary topicCitation
Ex Parte Reexamination Request35 U.S.C. § 2286
Ex Parte Reexamination RequestMPEP § 2242
Estoppel After JudgmentIn re Construction Equipment Company, 665 F.3d 1254, 100 USPQ2d 1922 (Fed. Cir. 2011)

Source Text from USPTO’s MPEP

This is an exact copy of the MPEP from the USPTO. It is here for your reference to see the section in context.

BlueIron Last Updated: 2025-12-31