US3447657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape rewinding accessory for computers,calculating machines,and the like
Assignee: HILL TOP RESEARCH Inc
•
Filing: 1967-04-27
•
Granted: 1969-06-03
•
Expires: 1987-04-27
Abstract
No abstract record available.
Inventors
- 👤 Paul A Majors
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:47
CPC Classifications
B; B41; B41J; B41J15/00; B41J15/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2497264A
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US1169318A
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US1098116A
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US1105082A
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US1286820A
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US1762749A
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US2264855A
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US2787357A
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US2843247A
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US3285384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |