US1891780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for recording and reproducing electrical impulses
Assignee: Individual
•
Filing: 1928-12-20
•
Granted: 1932-12-20
•
Expires: 1948-12-20
Abstract
No abstract record available.
Inventors
- 👤 Robert E Rutherford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:56
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/80; G; G11; G11B; G11B9/00; Y; Y10; Y10S; Y10S29/00; Y10S29/028
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) | 1935-12-20 | 1936-06-20 | 1936-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-12-20 | 1940-06-20 | 1940-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-12-20 | 1944-06-20 | 1944-12-20 | $7700.00 | Window Closed / Lapsed |