Patent US2227081A successfully refreshed from Google Patents.
US2227081A
Expired / Lapsed
US
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Metal cutting apparatus
Assignee: Individual
•
Filing: 1937-03-20
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Granted: 1940-12-31
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Expires: 1957-03-20
Abstract
No abstract record available.
Inventors
- 👤 Charles B Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:32
CPC Classifications
B; B23; B23D; B23D3/00; B23D3/04; Y; Y10; Y10S; Y10S83/00; Y10S83/916; Y10T; Y10T83/00; Y10T83/869; Y10T83/8759; Y10T83/8761; Y10T83/8762; Y10T83/8821; Y10T83/8841; Y10T83/8853; Y10T83/8867; Y10T83/929; Y10T83/9314
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) | 1943-12-31 | 1944-07-01 | 1944-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-12-31 | 1948-07-01 | 1948-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-12-31 | 1952-07-01 | 1952-12-31 | $7700.00 | Window Closed / Lapsed |