US1989652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for finishing internal gears
Assignee: Nachi Machining Technology Co
•
Filing: 1932-07-30
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Granted: 1935-01-29
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Expires: 1952-07-30
Abstract
No abstract record available.
Inventors
- 👤 Robert S Drummond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:52
CPC Classifications
B; B23; B23F; B23F19/00; B23F19/06; B23F19/02; B23F19/04; B23F23/00; B23F23/02; B23F23/06; Y; Y10; Y10T; Y10T29/00; Y10T29/47; Y10T29/477
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-01-28 | 1938-07-30 | 1939-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-01-28 | 1942-07-30 | 1943-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-01-28 | 1946-07-30 | 1947-01-29 | $7700.00 | Window Closed / Lapsed |