Patent US2236119A successfully refreshed from Google Patents.
US2522643A
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US
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Grinder
Assignee: AMERICAN DUPLEX Co
•
Filing: 1946-05-20
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Granted: 1950-09-19
•
Expires: 1966-05-20
Abstract
No abstract record available.
Inventors
- 👤 Richard L Schuhmann
- 👤 Frederic C Rudolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:32
CPC Classifications
A; A47; A47J; A47J42/00; A47J42/12; A47J42/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US215658A
Cited
US309187A
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US1206716A
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US1704754A
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US1928200A
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US1984869A
Cited
US2128226A
Cited
US2090634A
Cited
US2141311A
Cited
US2187102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-18 | 1954-03-20 | 1954-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-18 | 1958-03-20 | 1958-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-18 | 1962-03-20 | 1962-09-19 | $7700.00 | Window Closed / Lapsed |