US2849863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic variable speed drive device
Assignee: W M WELCH MANUFACTURING Co
•
Filing: 1954-07-20
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Granted: 1958-09-02
•
Expires: 1974-07-20
Abstract
No abstract record available.
Inventors
- 👤 Dubrovin John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:36
CPC Classifications
F; F16; F16H; F16H39/00; F16H39/04; F16H39/06; F16H39/34; F16H39/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US510600A
Cited
US1723493A
Cited
US2030299A
Cited
US2133135A
Cited
US2221308A
Cited
US2268135A
Cited
US2370526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |