Patent US2128742A successfully refreshed from Google Patents.
US2128742A
Expired / Lapsed
US
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Muffling device
Assignee: Ingersoll Rand Co
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Filing: 1937-04-09
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Granted: 1938-08-30
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Expires: 1957-04-09
Abstract
No abstract record available.
Inventors
- 👤 George H Fuehrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:21
CPC Classifications
B; B25; B25D; B25D17/00; B25D17/11; B25D17/12; Y; Y10; Y10S; Y10S173/00; Y10S173/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1941-08-29 | 1942-02-28 | 1942-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-08-29 | 1946-02-28 | 1946-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-08-29 | 1950-02-28 | 1950-08-30 | $7700.00 | Window Closed / Lapsed |