US2946862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ear protector and communication equipment
Assignee: David Clark Co Inc
•
Filing: 1955-03-21
•
Granted: 1960-07-26
•
Expires: 1975-03-21
Abstract
No abstract record available.
Inventors
- 👤 William B Wadsworth
- 👤 Forrest R Poole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:56
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/04; H04M1/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US304843A
Cited
US1367746A
Cited
US2353070A
Cited
US2485405A
Cited
US2535063A
Cited
US2603724A
Cited
FR1011517A
Cited
US2801423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-26 | 1964-01-25 | 1964-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-26 | 1968-01-25 | 1968-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-26 | 1972-01-25 | 1972-07-26 | $7700.00 | Window Closed / Lapsed |