Invalidity dossier
US 4482342
Blood processing system for cell washing
Current assignee: Haemonetics Corp
Added 9/23/2026, 1:26:32 PM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview: US 4,482,342 A — Blood Processing System for Cell Washing
Title: Blood processing system for cell washing
Assignee: Haemonetics Corp (original assignee); later assignments recorded to American Hospital Supply Corporation (1985), Latham Labs, Inc. (1986), and Haemonetics Corporation entities (1986).
Inventors: Richard M. Lueptow; Jeffrey J. Peterson
Key dates: Priority/filing date 1982-06-17; publication/grant date 1984-11-13; anticipated expiration 2002-06-17; legal status "Expired - Lifetime" (as listed). Priority also recorded for AU, EP, JP, and DK applications in 1983.
Purpose (plain language): The invention addresses centrifugal separation of fluids such as blood into two or more components, particularly the washing of packed red blood cells (RBC's) with a wash solution such as saline to remove undesirable components remaining after initial centrifugal separation.
Scope (plain language, from the excerpt): Packed RBC's are washed within a centrifugal processing bag. Washing efficiency is optimized by orienting the processing bag relative to the centrifuge center of rotation (CR) so that the highest-density component (washed RBC's) accumulates at the bag corner furthest from the CR, with the wash-solution inlet port located at that corner, while the lowest-density component (supernatant) accumulates at the corner closest to the CR, with the outlet port located there. A cassette support member is described as tilted inwardly from the vertical plane, with an eccentric cylindrical segment shape off-set from the CR axis. A rectangular bag with corners A–D is positioned against this double-angle support member, forcing an orientation in which the supernatant outlet port sits at the shortest radius r₁ (corner "A") and the wash-solution input port at the longest radius r₄ (corner "C").
Source: https://patents.google.com/patent/US4482342/en
What the excerpt does not establish: It does not establish the full claim language, the complete specification, the precise number of claims, or the exact figures/structure beyond the described support member and bag orientation. It does not establish litigation, validity, or the content of cited prior art (e.g., U.S. Pat. Nos. 4,007,871 and 4,010,894 mentioned only as describing the IBM 2991 Cell Washer).
Generated 10/1/2026, 9:53:07 PM
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PTAB challenges
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Assignment history
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Prior art
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Obviousness
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Extensions
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Derivative works
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