Patent US2721284A successfully refreshed from Google Patents.
US2721284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrating motor
Assignee: SUMMERS GYROSCOPE Co
•
Filing: 1952-05-03
•
Granted: 1955-10-18
•
Expires: 1972-05-03
Abstract
No abstract record available.
Inventors
- 👤 Edward M Elmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:32
CPC Classifications
H; H02; H02K; H02K3/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US377683A
Cited
US414659A
Cited
US541641A
Cited
US1605796A
Cited
US925504A
Cited
US1991696A
Cited
FR867162A
Cited
FR894422A
Cited
US2432267A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |