Patent US1928124A successfully refreshed from Google Patents.
Patent US2493571A successfully refreshed from Google Patents.
US2493571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toroidal transmission
Assignee: WILLIAM E VALK
•
Filing: 1944-10-06
•
Granted: 1950-01-03
•
Expires: 1964-10-06
Abstract
No abstract record available.
Inventors
- 👤 Chilton Roland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:36
CPC Classifications
F; F16; F16H; F16H15/00; F16H15/02; F16H15/04; F16H15/06; F16H15/32; F16H15/36; F16H15/38; F16H2015/383
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1774175A
Cited
US1903228A
Cited
US1947044A
Cited
GB415922A
Cited
US2108082A
Cited
US2113638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-02 | 1953-07-04 | 1954-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-02 | 1957-07-04 | 1958-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-02 | 1961-07-04 | 1962-01-03 | $7700.00 | Window Closed / Lapsed |