Patent US2764831A successfully refreshed from Google Patents.
US2764831A
Expired / Lapsed
US
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Assignee: Individual
•
Filing: 1950-09-29
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Granted: 1956-10-02
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Expires: 1970-09-29
Abstract
No abstract record available.
Inventors
- 👤 Jr John B Main
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:28
CPC Classifications
G; G09; G09F; G09F21/00; G09F21/06; G09F21/08; G09F21/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1727095A
Cited
US1729354A
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US1773549A
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US1903131A
Cited
US1999479A
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US2001200A
Cited
US2203623A
Cited
US1982960A
Cited
US2094890A
Cited
US2617220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-02 | 1960-04-02 | 1960-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-02 | 1964-04-02 | 1964-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-02 | 1968-04-02 | 1968-10-02 | $7700.00 | Window Closed / Lapsed |