US3421497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heart pump system
Assignee: RTX Corp
•
Filing: 1964-02-26
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Granted: 1969-01-14
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Expires: 1984-02-26
Abstract
No abstract record available.
Inventors
- 👤 Merrill G Chesnut
- 👤 Richard H Ball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:54
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/36; A61M1/3621; A61M1/3653; A61M1/3659; A61M60/00; A61M60/40; A61M60/424; A61M60/427; A61M60/432; A61M60/10; A61M60/104; A61M60/117; A61M60/122; A61M60/126; A61M60/13; A61M60/20; A61M60/247; A61M60/253; A61M60/268; A61M60/274; A61M60/438; A61M60/441; A61M60/50; A61M60/508; A61M60/515; A61M60/531; A61M60/538; A61M60/562; A61M60/569; A61M60/80; A61M60/845; A61M60/851; A61M60/855; A61M60/89; A61M60/892; A61M2205/00; A61M2205/33; A61M2205/3303; A61M60/258
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |