Patent US2786099A successfully refreshed from Google Patents.
US2786099A
Expired / Lapsed
US
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Sound amplifying apparatus for telephone circuits
Assignee: Individual
•
Filing: 1954-02-09
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Granted: 1957-03-19
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Expires: 1974-02-09
Abstract
No abstract record available.
Inventors
- 👤 Donald C Beatty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:31
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/60; H04M1/6033
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2281255A
Cited
US2369351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-18 | 1960-09-17 | 1961-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-18 | 1964-09-17 | 1965-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-18 | 1968-09-17 | 1969-03-19 | $7700.00 | Window Closed / Lapsed |