US3310148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expand device for proportional escapement typewriters
Assignee: International Business Machines Corp
•
Filing: 1964-06-26
•
Granted: 1967-03-21
•
Expires: 1984-06-26
Abstract
No abstract record available.
Inventors
- 👤 Kenneth A Lennon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:01
CPC Classifications
B; B41; B41J; B41J19/00; B41J19/18; B41J19/34; B41J19/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2217159A
Cited
US2294722A
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US2547449A
Cited
US2753973A
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US2905303A
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US2905304A
Cited
US2954861A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-20 | 1970-09-19 | 1971-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-20 | 1974-09-19 | 1975-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-20 | 1978-09-19 | 1979-03-21 | $7700.00 | Window Closed / Lapsed |