Patent US2976772A successfully refreshed from Google Patents.
US2976772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine tool
Assignee: Sheffield Corp
•
Filing: 1955-12-19
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Granted: 1961-03-28
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Expires: 1975-12-19
Abstract
No abstract record available.
Inventors
- 👤 Jesse H Straw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:04
CPC Classifications
B; B23; B23F; B23F23/00; B23F23/08; B23F19/00; B23F19/10; B23F19/101; B23F19/102; B23F19/107; Y; Y10; Y10T; Y10T409/00; Y10T409/10; Y10T409/101113
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1511213A
Cited
US1960536A
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US1975151A
Cited
US2116181A
Cited
US2135819A
Cited
US2372815A
Cited
US2433201A
Cited
US2668480A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |