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United States Patent and Trademark Office › Intellectual Property Protection › Central Reexamination Unit (CRU)

The U.S. Patent and Trademark Office is an agency of the United States Department of Commerce that serves a fundamental role in the U.S. intellectual property system by issuing patents and registering trademarks.... more +
The U.S. Patent and Trademark Office is an agency of the United States Department of Commerce that serves a fundamental role in the U.S. intellectual property system by issuing patents and registering trademarks.    less -
Fish & Richardson

EPRx 101: Getting to Know Ex Parte Reexamination

Fish & Richardson on

Ex parte reexamination (EPRx) is a powerful tool that allows any party — including the patent owner — to request that the United States Patent and Trademark Office (USPTO) reassess the validity of an issued patent based on...more

Sterne, Kessler, Goldstein & Fox P.L.L.C.

Reexamination of Expired Patents

Sterne, Kessler, Goldstein & Fox P.L.L.C. on

Takeaways - - Expired patents may be eligible for reexamination. - Owner’s options during reexamination of an expired patent are severely limited. Similar to reexamination practice, which has long allowed reexamination...more

Sterne, Kessler, Goldstein & Fox P.L.L.C.

Antedating Prior Art in Reissue and Reexamination: Part 1

Sterne, Kessler, Goldstein & Fox P.L.L.C. on

Takeaways - - Pre-AIA patents may be able to “swear behind” prior art applied in reissue and reexamination. - “Swearing behind” has limits and obtaining sufficient evidence to establish prior invention may be difficult to...more

Sterne, Kessler, Goldstein & Fox P.L.L.C.

Sterne Kessler’s Reissue, Reexamination, and Supplemental Examination Practice Tips – February 2025

Sterne, Kessler, Goldstein & Fox P.L.L.C. on

In the mid-2000s, the U.S. Patent Office (USPTO) determined that reexaminations would be more consistent and legally correct if performed by a centralized set of experienced and specially trained Examiners. As a result, the...more

Sterne, Kessler, Goldstein & Fox P.L.L.C.

Sterne Kessler’s Reissue, Reexamination, and Supplemental Examination Practice Tips – January 2025

Sterne, Kessler, Goldstein & Fox P.L.L.C. on

In the mid-2000s, the U.S. Patent Office (USPTO) determined that reexaminations would be more consistent and legally correct if performed by a centralized set of experienced and specially trained Examiners. As a result, the...more

Sterne, Kessler, Goldstein & Fox P.L.L.C.

The Reissue Recapture Doctrine

Sterne, Kessler, Goldstein & Fox P.L.L.C. on

One of the advantages of filing a reissue application within two years of the original patent’s grant is the ability to seek broader claims. More often than not, however, a broadening Reissue will be rejected by the CRU...more

Sterne, Kessler, Goldstein & Fox P.L.L.C.

Sterne Kessler’s Reissue, Reexamination, and Supplemental Examination Practice Tips – May 2024

Sterne, Kessler, Goldstein & Fox P.L.L.C. on

In the mid-2000s, the U.S. Patent Office (USPTO) determined that reexaminations would be more consistent and legally correct if performed by a centralized set of experienced and specially trained Examiners. As a result, the...more

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