US3476143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pivoting disc heart valve
Assignee: University of Minnesota Twin Cities
•
Filing: 1967-04-17
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Granted: 1969-11-04
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Expires: 1987-04-17
Abstract
No abstract record available.
Inventors
- 👤 Robert L Kaster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:55
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/24; A61F2/2403; A61F2/2406; A61F2/2409; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7898; Y10T137/7903
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US718657A
Cited
GB191015264A
Cited
US2282532A
Cited
US2840317A
Cited
US3374489A
Cited
US3312237A
Cited
US3367364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |