US1201271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oscillating audion.
Assignee: DE FOREST RADIO TELEPHONE AND TELEGRAPH Co
•
Filing: 1915-07-22
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Granted: 1916-10-17
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Expires: 1935-07-22
Abstract
No abstract record available.
Inventors
- 👤 Lee De Forest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:04
CPC Classifications
H; H01; H01J; H01J7/00; H01J7/24
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) | 1919-10-17 | 1920-04-17 | 1920-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1923-10-17 | 1924-04-17 | 1924-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1927-10-17 | 1928-04-17 | 1928-10-17 | $7700.00 | Window Closed / Lapsed |