US2796534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photo-electric tone generator
Assignee: WILBESPAN RES LABS Inc
•
Filing: 1951-01-23
•
Granted: 1957-06-18
•
Expires: 1971-01-23
Abstract
No abstract record available.
Inventors
- 👤 Richard E Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:22
CPC Classifications
G; G10; G10H; G10H3/00; G10H3/03; G10H3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1678872A
Cited
US2075802A
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US2169842A
Cited
US2484914A
Cited
US2524531A
Cited
US2571141A
Cited
US2506599A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-17 | 1960-12-17 | 1961-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-17 | 1964-12-17 | 1965-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-17 | 1968-12-17 | 1969-06-18 | $7700.00 | Window Closed / Lapsed |