US2788620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding apparatus
Assignee: AT&T Inc
•
Filing: 1954-12-30
•
Granted: 1957-04-16
•
Expires: 1974-12-30
Abstract
No abstract record available.
Inventors
- 👤 Jerome R Marcus
- 👤 Radakovich Fred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:12
CPC Classifications
B; B24; B24B; B24B9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE273013C
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US1008784A
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US1736159A
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US1926959A
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US1945662A
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US2092895A
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US2117917A
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US2229312A
Cited
US2406526A
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US2671293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |