US2940537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means and techniques for silencing sound energy
Assignee: GEN SOUND CONTROL Inc
•
Filing: 1957-01-04
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Granted: 1960-06-14
•
Expires: 1977-01-04
Abstract
No abstract record available.
Inventors
- 👤 Cloyd D Smith
- 👤 Robert L Mathews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:21
CPC Classifications
B; B64; B64F; B64F1/00; B64F1/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1539595A
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US1658402A
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US2081306A
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US2056608A
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US2685936A
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US2600262A
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US2720276A
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BE521636A
Cited
GB766985A
Cited
US2845775A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |