US2803308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ear-tip for stethoscope type headset
Assignee: Dictaphone Corp
•
Filing: 1955-08-11
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Granted: 1957-08-20
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Expires: 1975-08-11
Abstract
No abstract record available.
Inventors
- 👤 Mattia Alfred L Di
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:24
CPC Classifications
A; A61; A61B; A61B7/00; A61B7/02; H; H04; 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)
US1045812A
Cited
US1893474A
Cited
US2220208A
Cited
US2288966A
Cited
US2650633A
Cited
US2605195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |