US1331151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording system and apparatus
Assignee: American District Telegraph Co
•
Filing: 1917-01-27
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Granted: 1920-02-17
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Expires: 1937-01-27
Abstract
No abstract record available.
Inventors
- 👤 Richard M Hopkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:45
CPC Classifications
G; G07; G07C; G07C1/00; G07C1/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1923-02-16 | 1923-08-18 | 1924-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1927-02-16 | 1927-08-18 | 1928-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1931-02-16 | 1931-08-18 | 1932-02-17 | $7700.00 | Window Closed / Lapsed |