US3453522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audiofrequency transmitter including a load-guided inverter and direct coupling filter
Assignee: Landis and Gyr AG
•
Filing: 1967-03-20
•
Granted: 1969-07-01
•
Expires: 1987-03-20
Abstract
No abstract record available.
Inventors
- 👤 Rudolf Arthur Ausfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:37
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/523
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2294388A
Cited
US2429652A
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US2934722A
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US3129374A
Cited
US3271654A
Cited
US3303405A
Cited
US3332001A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |