Patent US2504306A successfully refreshed from Google Patents.
US2504306A
Expired / Lapsed
US
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Change-speed mechanism for machine tools
Assignee: Warner and Swasey Co
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Filing: 1946-05-03
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Granted: 1950-04-18
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Expires: 1966-05-03
Abstract
No abstract record available.
Inventors
- 👤 Myron S Curtis
- 👤 Schoepe Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:49
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0202; F16H2716/00; F16H2716/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US796828A
Cited
GB190209111A
Cited
US894878A
Cited
US961107A
Cited
US1648479A
Cited
US1863110A
Cited
FR777259A
Cited
FR823798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |