US2483231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loud-speaking telephone set with low acoustic coupling
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1946-08-17
•
Granted: 1949-09-27
•
Expires: 1966-08-17
Abstract
No abstract record available.
Inventors
- 👤 Edward S Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:53
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/34; H04R1/345; H04M; H04M1/00; H04M1/60; H04M1/6033
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2114680A
Cited
US2263233A
Cited
US2177769A
Cited
US2208160A
Cited
US2381174A
Cited
US2385279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-26 | 1953-03-28 | 1953-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-26 | 1957-03-28 | 1957-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-26 | 1961-03-28 | 1961-09-27 | $7700.00 | Window Closed / Lapsed |