US2818760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modulation system for electrical musical instrument
Assignee: Individual
•
Filing: 1953-09-28
•
Granted: 1958-01-07
•
Expires: 1973-09-28
Abstract
No abstract record available.
Inventors
- 👤 James M Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:05
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; H; H03; H03C; H03C3/00; H03C3/10; H03C3/28; Y; Y10; Y10S; Y10S84/00; Y10S84/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1485156A
Cited
GB258643A
Cited
US2273975A
Cited
US2368643A
Cited
US2551807A
Cited
US2535341A
Cited
US2656755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |