US2780681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earphones for use with dictating machines and the like
Assignee: Dyna-Labs Inc
•
Filing: 1954-07-01
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Granted: 1957-02-05
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Expires: 1974-07-01
Abstract
No abstract record available.
Inventors
- 👤 Harry B Shaper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:57
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/04; H04M1/05; H04R; H04R1/00; H04R1/10; H04R1/1016; H04R1/20; H04R1/32; H04R1/34; H04R1/345; H04R5/00; H04R5/033; H04R5/0335
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2498960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |