US2837638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse generator
Assignee: Hazeltine Research Inc
•
Filing: 1953-06-03
•
Granted: 1958-06-03
•
Expires: 1973-06-03
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Frink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:29
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/53; H03K3/55
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2496979A
Cited
US2420302A
Cited
US2420309A
Cited
US2534261A
Cited
US2446838A
Cited
US2606289A
Cited
US2595301A
Cited
US2474243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |