Patent US2817428A successfully refreshed from Google Patents.
US2817428A
Expired / Lapsed
US
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Electric typewriting machine
Assignee: Individual
•
Filing: 1955-09-15
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Granted: 1957-12-24
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Expires: 1975-09-15
Abstract
No abstract record available.
Inventors
- 👤 Yngve L Appelberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:04
CPC Classifications
B; B41; B41J; B41J3/00; B41J3/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1520089A
Cited
US2675108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |