Patent US2486770A successfully refreshed from Google Patents.
US2486770A
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Arc generated thread form for helical rotary members
Assignee: Individual
•
Filing: 1946-08-21
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Granted: 1949-11-01
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Expires: 1966-08-21
Abstract
No abstract record available.
Inventors
- 👤 Joseph E Whitfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:56
CPC Classifications
F; F01; F01C; F01C1/00; F01C1/08; F01C1/12; F01C1/14; F01C1/16; F04; F04C; F04C18/00; F04C18/08; F04C18/12; F04C18/14; F04C18/16; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19949; Y10T74/19953
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) | 1952-10-31 | 1953-05-02 | 1953-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-31 | 1957-05-02 | 1957-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-31 | 1961-05-02 | 1961-11-01 | $7700.00 | Window Closed / Lapsed |