Patent US2964641A successfully refreshed from Google Patents.
US2964641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for identification of engraved documents
Assignee: Individual
•
Filing: 1957-04-26
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Granted: 1960-12-13
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Expires: 1977-04-26
Abstract
No abstract record available.
Inventors
- 👤 Paul J Selgin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:34
CPC Classifications
G; G06; G06K; G06K19/00; G06K19/06; G06K19/08; G06K19/10; G06K19/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2375665A
Cited
US2552156A
Cited
US2646717A
Cited
US2712640A
Cited
US2731621A
Cited
US2827822A
Cited
US2922893A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-13 | 1964-06-13 | 1964-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-13 | 1968-06-13 | 1968-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-13 | 1972-06-13 | 1972-12-13 | $7700.00 | Window Closed / Lapsed |