US2634337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined microphone and receiver for audiphones
Assignee: Individual
•
Filing: 1947-12-05
•
Granted: 1953-04-07
•
Expires: 1967-12-05
Abstract
No abstract record available.
Inventors
- 👤 Reginald B Bland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:38
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/45; H04R25/456; H04R25/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US344333A
Cited
US517763A
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GB190401081A
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US1227030A
Cited
GB241343A
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GB253503A
Cited
US1697659A
Cited
US2327136A
Cited
US2306707A
Cited
US2375010A
Cited
US2485405A
Cited
US2417153A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-06 | 1956-10-06 | 1957-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-06 | 1960-10-06 | 1961-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-06 | 1964-10-06 | 1965-04-07 | $7700.00 | Window Closed / Lapsed |