Patent US3538427A successfully refreshed from Google Patents.
Patent US2855068A successfully refreshed from Google Patents.
US2855068A
Expired / Lapsed
US
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Muffler
Assignee: GRAND SHEET METAL PRODUCTS CO
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Filing: 1956-12-28
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Granted: 1958-10-07
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Expires: 1976-12-28
Abstract
No abstract record available.
Inventors
- 👤 Glen R Chapel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:36
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/18; F01N1/00; F01N1/08; F01N1/10; F01N13/009; F01N2310/00; F01N2310/02; F01N2450/00; F01N2450/22; F01N2470/00; F01N2470/02; F01N2470/24; F01N2530/00; F01N2530/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |