US2982941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional sound apparatus
Assignee: Individual
•
Filing: 1950-07-17
•
Granted: 1961-05-02
•
Expires: 1970-07-17
Abstract
No abstract record available.
Inventors
- 👤 Melvin E Chun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:55
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/80; G01S3/802; G01S3/805; G01S3/8055
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2044789A
Cited
US2051032A
Cited
US2074408A
Cited
US2166991A
Cited
US2456666A
Cited
US2438526A
Cited
GB610664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-01 | 1964-10-31 | 1965-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-01 | 1968-10-31 | 1969-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-01 | 1972-10-31 | 1973-05-02 | $7700.00 | Window Closed / Lapsed |