Patent US2221135A successfully refreshed from Google Patents.
Patent US3608097A successfully refreshed from Google Patents.
US3608097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-return valves particularly as prosthetics
Assignee: Individual
•
Filing: 1969-01-03
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Granted: 1971-09-28
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Expires: 1989-01-03
Abstract
Abstract A CHECK-VALVE WHICH IS PARTICULARLY THOUGH NOT SOLELY APPLICABLE AS A PROSTHESIS IN CARDIAC SURGERY: IT CONCERNS A VALVE WHICH HAS PLURAL CUSP-LIKE PLIABLE ELEMENTS WHICH ARE ASSOCIATED WITH A DUCT FORMATION SUCH AS TO AFFORD A FLUID-DYNAMIC PRESSURE EFFECT TENDING TO CLOSE THE VALVE THE ARRANGEMENT OF THE VALVE BEING SUCH AS TO MINIMIZE TURBULENCE WHEN FLUID FLOWS THROUGH IT. THE CUSPS ARE SUPPORTED BY A RIGID FRAME HAVING THREE UPSTANDING POSTS SPACED ABOUT 120* APART AND FORM A SUBSTANTIALLY CYLINDRICAL OPENING WHEN THE VALVE IS AT REST. THE CUSPS ARE MOVED TO THE CLOSED POSITION WHEN REVERSAL OF FLUID FLOW OCCURS THROUGH THE VALVE.
Inventors
- 👤 Brian John Bellhouse
- 👤 Francis Hewitt Bellhouse
- 👤 Kenneth Grant Reid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:46
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/24; A61F2/2412; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7879; Y10T137/788
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |