Invalidity dossier
US 5651766
Blood collection and separation system
Current assignee: Haemonetics Corp
Added 9/23/2026, 12:30:40 PM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 5,651,766 A
Title: Blood collection and separation system
Patent number / application: US 5,651,766 A (application US08/482,617)
Assignee of record (as listed): Original assignee Transfusion Technologies Corp.; current assignee listed as Haemonetics Corp. The source notes listed assignees may be inaccurate and that Google Patents performed no analysis or warranty as to accuracy.
Key dates: Priority/filing date 1995-06-07; publication (grant) date 1997-07-29; anticipated expiration 2015-06-07; legal status "Expired – Lifetime."
Inventors: Gordon F. Kingsley, Thomas D. Headley, Lise N. Halpern.
Purpose (from the excerpt's Definitions): The invention "relates to a method of whole-blood collection and the preparation of components therefrom following collection." The excerpt describes conventional collection: a needle is placed in a donor's vein and whole blood flows by gravity into a bag containing anticoagulant; a US unit of whole blood is defined as 450 ml; the anticoagulant-to-whole-blood ratio is about one to seven (about 63 ml anticoagulant for a full unit); and the ratio is considerably higher than one to seven at the beginning of collection, so red cells entering early are subject to "anticoagulant s[tress]" (sentence truncated in the excerpt).
Scope indicators from classification and prior-art keywords: Classifications include B04B5/04 (radial-chamber centrifuges for separating liquids, including with flexible receptacles), A61M1/36 and A61M1/3693 (extracorporeal blood circuits using density-based separation, e.g., centrifuging), A61M1/3696 (continuous centrifugation with means for adding/withdrawing liquid during centrifugation), and A61M1/3698 (expressing processed fluid from a turning rotor using another fluid; variable-volume rotors). Prior-art keywords listed: rotor, blood, flow, container, donor. Related family members include WO1996040319A1 and EP0830157B1.
Source: https://patents.google.com/patent/US5651766/en (fetched 2026-09-23).
What the excerpt does not establish: The full claims, detailed description, and drawings are not reproduced, so the precise claimed method and apparatus scope cannot be determined. The truncation ("anticoagulant s…") leaves that passage incomplete. The excerpt supplies no litigation, validity, or ownership-analysis information.
Generated 10/1/2026, 9:53:34 PM
Cases on file (0)
Specific litigation cases in our database that name US patent 5651766. The free-form analysis below may also discuss cases beyond this list.
No cases on file mention this patent. Upload a CSV or add a case manually in Admin → Manage litigation cases.
Litigation summary
Past and pending lawsuits — plaintiffs, defendants, jurisdictions, outcomes, and notable rulings.
Proceedings on file (0)
All PTAB activity →AIA trial proceedings (IPR / PGR / CBM) filed at the USPTO Patent Trial and Appeal Board against this patent. Sourced from the USPTO Open Data Portal and refreshed every six hours; each proceeding number deep-links to the PTAB E2E docket.
No PTAB proceedings on file. This patent has not been challenged via IPR, PGR, or CBM. The absence is itself a signal — well-asserted patents eventually attract IPRs. The LLM analysis below may surface filings the ODP feed hasn’t indexed yet.
PTAB challenges
AIA trial proceedings at the USPTO Patent Trial and Appeal Board — IPR, PGR, and CBM. Petitioners, judge panels, claim-level invalidation outcomes from Final Written Decisions, and Federal Circuit appeals. The single most important defensive datapoint after litigation history.
Assignment history
Inventors, original assignee, and the chain of ownership recorded with the USPTO — including the correspondent attorney who recorded each assignment, since shell-LLC chains often share one repeat-player attorney even when the entity names look unrelated. Surfaces NPE / patent-troll patterns: shell-entity transfers, known asserters in the chain, repeat correspondent fingerprints, pre-litigation assignments, and bankruptcy fire-sales.
Prior art
Earlier patents, publications, and products that may anticipate or render the claims unpatentable.
Obviousness
Combinations of prior art that suggest the claimed invention would have been obvious under 35 U.S.C. § 103.
Extensions
Patent term adjustments, term extensions, continuations, divisionals, family members, and expiration dates.
Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.