Patent US2431795A successfully refreshed from Google Patents.
US2431795A
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Grinding apparatus
Assignee: WALTER L RYAN
•
Filing: 1945-11-21
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Granted: 1947-12-02
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Expires: 1965-11-21
Abstract
No abstract record available.
Inventors
- 👤 John A Elmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:52
CPC Classifications
B; B24; B24B; B24B21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US294766A
Cited
US759995A
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US844366A
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US832889A
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US1082670A
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US1167244A
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US1735903A
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US2332329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-01 | 1951-06-02 | 1951-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-01 | 1955-06-02 | 1955-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-01 | 1959-06-02 | 1959-12-02 | $7700.00 | Window Closed / Lapsed |