US3534411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cloth covered heart valve
Assignee: Individual
•
Filing: 1967-10-05
•
Granted: 1970-10-20
•
Expires: 1987-10-05
Abstract
No abstract record available.
Inventors
- 👤 Donald P Shiley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:04
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/24; A61F2/2421
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3263239A
Cited
DE1180087B
Cited
US3371252A
Cited
US3396409A
Cited
US3464065A
Cited
US3445863A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |