Patent US2320672A successfully refreshed from Google Patents.
US2320672A
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US
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Machine for grinding curved surfaces
Assignee: Cold Spring Granite Co
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Filing: 1940-11-25
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Granted: 1943-06-01
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Expires: 1960-11-25
Abstract
No abstract record available.
Inventors
- 👤 Albert A Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:09
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/06; B24B13/065; B23; B23Q; B23Q1/00; B23Q1/25; B23Q1/44; B23Q1/48; B23Q1/4804
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) | 1946-05-31 | 1946-11-30 | 1947-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-05-31 | 1950-11-30 | 1951-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-05-31 | 1954-11-30 | 1955-06-01 | $7700.00 | Window Closed / Lapsed |