Patent US2535539A successfully refreshed from Google Patents.
US2535539A
Expired / Lapsed
US
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Bottom margin control device for typewriters
Assignee: Individual
•
Filing: 1949-08-29
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Granted: 1950-12-26
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Expires: 1969-08-29
Abstract
No abstract record available.
Inventors
- 👤 Lee Chin Yi
- 👤 Hu Quang Hsi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:32
CPC Classifications
B; B41; B41J; B41J29/00; B41J29/54; B41J29/58; B41J29/68
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US348511A
Cited
US1053919A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-25 | 1954-06-26 | 1954-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-25 | 1958-06-26 | 1958-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-25 | 1962-06-26 | 1962-12-26 | $7700.00 | Window Closed / Lapsed |