US3438394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toroidal heart valve
Assignee: University of Minnesota Twin Cities
•
Filing: 1965-12-10
•
Granted: 1969-04-15
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Expires: 1985-12-10
Abstract
No abstract record available.
Inventors
- 👤 Ahmad A Nakib
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:10
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/24; A61F2/2421; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7859; Y10T137/7861; Y10T137/7862; Y10T137/7863; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/7913; Y10T137/7914
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US215800A
Cited
US453347A
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US1354318A
Cited
US1379173A
Cited
US1326923A
Cited
US2275627A
Cited
FR1061785A
Cited
US2969804A
Cited
US3099016A
Cited
US3191905A
Cited
US3367364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |