US2649557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric potential comparing circuit
Assignee: International Standard Electric Corp
•
Filing: 1950-01-28
•
Granted: 1953-08-18
•
Expires: 1970-01-28
Abstract
No abstract record available.
Inventors
- 👤 David H Ranson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:35
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1825514A
Cited
FR726579A
Cited
US2085440A
Cited
US2139232A
Cited
US2149092A
Cited
US2227468A
Cited
US2338423A
Cited
US2351016A
Cited
US2411531A
Cited
US2454781A
Cited
US2462074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-17 | 1957-02-16 | 1957-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-17 | 1961-02-16 | 1961-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-17 | 1965-02-16 | 1965-08-18 | $7700.00 | Window Closed / Lapsed |