US2872014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable backspacing mechanism for proportional spacing typewriters
Assignee: Individual
•
Filing: 1954-11-08
•
Granted: 1959-02-03
•
Expires: 1974-11-08
Abstract
No abstract record available.
Inventors
- 👤 Khalil Seyed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:49
CPC Classifications
B; B41; B41J; B41J25/00; B41J25/02; B41J25/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-02 | 1962-08-04 | 1963-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-02 | 1966-08-04 | 1967-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-02 | 1970-08-04 | 1971-02-03 | $7700.00 | Window Closed / Lapsed |