US3540157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for generating internal and external involute and non-involute gears
Assignee: Individual
•
Filing: 1968-01-29
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Granted: 1970-11-17
•
Expires: 1988-01-29
Abstract
No abstract record available.
Inventors
- 👤 Peter Herbert Cleff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:21
CPC Classifications
B; B23; B23F; B23F23/00; B23F23/12; B23F23/1237; B23F23/1262; B23F1/00; B23F1/02; B23F5/00; B23F5/02; B23F5/08; B23F5/085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-16 | 1974-05-18 | 1974-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-16 | 1978-05-18 | 1978-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-16 | 1982-05-18 | 1982-11-17 | $7700.00 | Window Closed / Lapsed |