US2523340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable recording device
Assignee: Individual
•
Filing: 1945-11-15
•
Granted: 1950-09-26
•
Expires: 1965-11-15
Abstract
No abstract record available.
Inventors
- 👤 Bonsall Robert Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:09
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/001; G11B33/00; G11B33/02; G11B33/022; G11B33/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1171082A
Cited
US1069784A
Cited
US1146418A
Cited
US1653410A
Cited
US1766992A
Cited
US1734172A
Cited
US2053108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-25 | 1954-03-27 | 1954-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-25 | 1958-03-27 | 1958-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-25 | 1962-03-27 | 1962-09-26 | $7700.00 | Window Closed / Lapsed |