US1795648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency-oscillation generator
Assignee: AT&T Inc
•
Filing: 1928-04-03
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Granted: 1931-03-10
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Expires: 1948-04-03
Abstract
No abstract record available.
Inventors
- 👤 Harald T Frils
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:05
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/08; H03B5/10
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) | 1934-03-09 | 1934-09-08 | 1935-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-03-09 | 1938-09-08 | 1939-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-03-09 | 1942-09-08 | 1943-03-10 | $7700.00 | Window Closed / Lapsed |