US2692918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic sound powered telephone
Assignee: Individual
•
Filing: 1952-07-09
•
Granted: 1954-10-26
•
Expires: 1972-07-09
Abstract
No abstract record available.
Inventors
- 👤 Samuel I Berger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:52
CPC Classifications
H; H04; H04R; H04R11/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2245511A
Cited
US2400281A
Cited
US2454425A
Cited
US2523775A
Cited
US2582942A
Cited
US2536179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-25 | 1958-04-26 | 1958-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-25 | 1962-04-26 | 1962-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-25 | 1966-04-26 | 1966-10-26 | $7700.00 | Window Closed / Lapsed |