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Patent US2859665A successfully refreshed from Google Patents.
US2859665A
Expired / Lapsed
US
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Apparatus for relieving portions of the thread flanks of double enveloping worm elements
Assignee: Michigan Tool Co
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Filing: 1956-12-21
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Granted: 1958-11-11
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Expires: 1976-12-21
Abstract
No abstract record available.
Inventors
- 👤 Fred E Birtch
- 👤 Bernard H Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:41
CPC Classifications
B; B23; B23F; B23F13/00; B23F13/06; B23F19/00; B23F19/002; Y; Y10; Y10T; Y10T409/00; Y10T409/10; Y10T409/101431; Y10T409/106519; Y10T409/107473
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) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |