US2858544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise attenuating device
Assignee: MSA Safety Inc
•
Filing: 1956-05-04
•
Granted: 1958-11-04
•
Expires: 1976-05-04
Abstract
No abstract record available.
Inventors
- 👤 Herman P Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:59
CPC Classifications
A; A61; A61F; A61F11/00; A61F11/06; A61F11/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE524025C
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US1438171A
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US1583540A
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US1845205A
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US1988880A
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US2413283A
Cited
US2437748A
Cited
US2671221A
Cited
US2684067A
Cited
US2784407A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-03 | 1962-05-05 | 1962-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-03 | 1966-05-05 | 1966-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-03 | 1970-05-05 | 1970-11-04 | $7700.00 | Window Closed / Lapsed |