Patent US1610455A successfully refreshed from Google Patents.
US1610455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for controlling electric motors
Assignee: Otis Elevator Co
•
Filing: 1920-09-02
•
Granted: 1926-12-14
•
Expires: 1940-09-02
Abstract
No abstract record available.
Inventors
- 👤 Jacob D Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:36
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/12; H02K17/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1929-12-13 | 1930-06-14 | 1930-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-12-13 | 1934-06-14 | 1934-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-12-13 | 1938-06-14 | 1938-12-14 | $7700.00 | Window Closed / Lapsed |