Patent US4220815B1 successfully refreshed from Google Patents.
US2938378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical dynamometer
Assignee: General Electric Co
•
Filing: 1956-02-29
•
Granted: 1960-05-31
•
Expires: 1976-02-29
Abstract
No abstract record available.
Inventors
- 👤 Alfred H Canada
- 👤 Jager Donald De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:15
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/36; G01D5/38; G01L; G01L3/00; G01L3/02; G01L3/04; G01L3/10; G01L3/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1800044A
Cited
US2136223A
Cited
US2313923A
Cited
US2246002A
Cited
US2256170A
Cited
US2280038A
Cited
US2402719A
Cited
US2589421A
Cited
US2586540A
Cited
US2541437A
Cited
US2813460A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |