Patent US2534735A successfully refreshed from Google Patents.
US2534735A
Expired / Lapsed
US
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Guarded stylus
Assignee: Dictaphone Corp
•
Filing: 1945-01-19
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Granted: 1950-12-19
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Expires: 1965-01-19
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Roberts
- 👤 Yerkovich Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:40
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/44; G11B3/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1391425A
Cited
US1879722A
Cited
GB371227A
Cited
US2280763A
Cited
US2276562A
Cited
US2249713A
Cited
US2320416A
Cited
US2325343A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-18 | 1954-06-19 | 1954-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-18 | 1958-06-19 | 1958-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-18 | 1962-06-19 | 1962-12-19 | $7700.00 | Window Closed / Lapsed |