Invalidity dossier
US 027852
Added 4/28/2026, 2:47:24 PM
Got a demand letter citing US 027852?
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Generic sample response letter (PDF)
Generates a draft reply letter to a generic infringement claim citing this patent, using the analysis below. For a response tailored to a specific letter you received, use the demand letter analyzer instead. Sample only — not legal advice. Do not send without review by a licensed patent attorney.
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Analysis of US Patent 027852
As of April 28, 2026, a search for U.S. Patent number 027852 in the United States Patent and Trademark Office (USPTO) database and the dockets of the Court of Appeals for the Federal Circuit (CAFC) for 2026 did not yield a matching utility patent. The number "027852" does not conform to standard modern or historical USPTO utility patent numbering conventions.
It is possible that this number corresponds to a different type of patent (e.g., a design patent, though formatting is still atypical) or contains a typographical error. Searches for similar numbers have revealed patents related to coronaviruses, but these are distinct from the requested patent number. For instance, U.S. Patent 7,220,852 B1, titled "Coronavirus isolated from humans," was issued on May 22, 2007. Additionally, U.S. Patent Application Publication No. 2006/0257852 A1, titled "Severe acute respiratory syndrome coronavirus," was published on November 16, 2006.
A document with the number 27852 was found in the Federal Register (86 FR 27852), related to a "Prospective Grant of an Exclusive Patent License" for "Methods and Compositions for Adoptive Cell Therapy." However, this is a notice and not a granted patent.
Given the literal interpretation of the patent number as requested, no responsive patent, and therefore no associated title, assignee, inventors, dates, abstract, or claims, can be provided. No litigation records for a patent with this number were found in the CAFC dockets for 2026. If "027852" is a valid identifier for a specific intellectual property right, it may not be a U.S. utility patent.
Generated 4/28/2026, 8:15:15 PM