US2544027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hearing aid attachment for use on french type telephones
Assignee: Individual
•
Filing: 1948-07-16
•
Granted: 1951-03-06
•
Expires: 1968-07-16
Abstract
No abstract record available.
Inventors
- 👤 Raymond E King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:33
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1842190A
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FR803291A
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US2353070A
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US2424422A
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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 |