US2474789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable-speed drive
Assignee: Individual
•
Filing: 1945-06-01
•
Granted: 1949-06-28
•
Expires: 1965-06-01
Abstract
No abstract record available.
Inventors
- 👤 Perhacs Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:49
CPC Classifications
F; F16; F16D; F16D21/00; F16D21/02; F16D21/04; F16H; F16H61/00; F16H61/66; F16H61/662
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US439316A
Cited
US1015254A
Cited
US1895821A
Cited
US2034767A
Cited
US1909522A
Cited
US2377575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-27 | 1952-12-27 | 1953-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-27 | 1956-12-27 | 1957-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-27 | 1960-12-27 | 1961-06-28 | $7700.00 | Window Closed / Lapsed |