Patent US1515568A successfully refreshed from Google Patents.
US1515568A
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US
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Grinding machine
Assignee: VAN NORMAN MACHINE TOOL CO
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Filing: 1921-03-02
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Granted: 1924-11-11
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Expires: 1941-03-02
Abstract
No abstract record available.
Inventors
- 👤 George W Fleming
- 👤 Robert W Ellingham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:32
CPC Classifications
B; B24; B24B; B24B19/00; B24B19/14; Y; Y10; Y10T; Y10T409/00; Y10T409/30; Y10T409/30868; Y10T82/00; Y10T82/14
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) | 1927-11-11 | 1928-05-12 | 1928-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-11-11 | 1932-05-12 | 1932-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-11-11 | 1936-05-12 | 1936-11-11 | $7700.00 | Window Closed / Lapsed |