Patent US2543761A successfully refreshed from Google Patents.
US2543761A
Expired / Lapsed
US
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Handset support and induction pickup for telephone amplifying systems
Assignee: Individual
•
Filing: 1947-07-21
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Granted: 1951-03-06
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Expires: 1967-07-21
Abstract
No abstract record available.
Inventors
- 👤 Chirite John Douglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:59
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/21; H04M1/215
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2005973A
Cited
US2160829A
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US2214992A
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US2320838A
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US2354470A
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US2381097A
Cited
US2384604A
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US2402341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |