Patent US2544027A successfully refreshed from Google Patents.
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 15:06
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/03
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE273228C
Cited
US1842190A
Cited
US1154069A
Cited
US1928669A
Cited
US1983178A
Cited
FR804178A
Cited
FR803291A
Cited
US2214992A
Cited
US2218389A
Cited
US2306707A
Cited
US2353070A
Cited
US2424422A
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 |