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US3431847A
Expired / Lapsed
US
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Perforating printing improvement
Assignee: CORUM CORP A CORP OF
•
Filing: 1967-03-31
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Granted: 1969-03-11
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Expires: 1987-03-31
Abstract
No abstract record available.
Inventors
- 👤 George B Smith
- 👤 Robert A Vested
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:53
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/18; B26F1/20; B41; B41G; B41G7/00; Y; Y10; Y10T; Y10T24/00; Y10T24/39; Y10T24/3998
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1855212A
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US2089225A
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US2007544A
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US2127246A
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US2946281A
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US2842202A
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US3099212A
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US3138097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-10 | 1972-09-09 | 1973-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-10 | 1976-09-09 | 1977-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-10 | 1980-09-09 | 1981-03-11 | $7700.00 | Window Closed / Lapsed |