Patent US3530649A successfully refreshed from Google Patents.
US3530649A
Expired / Lapsed
US
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Air pollution control device for engines
Assignee: CHESTER M SHELTON
•
Filing: 1968-06-28
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Granted: 1970-09-29
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Expires: 1988-06-28
Abstract
No abstract record available.
Inventors
- 👤 Fred W Porsch
- 👤 Chester M Shelton
- 👤 Lawrence O Dove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:42
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/26; F01N3/02; F01N3/021; F01N3/037; F01N2240/00; F01N2240/20; F01N2370/00; F01N2370/22; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US672531A
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US992839A
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US1081348A
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US2273210A
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US2738854A
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US2951551A
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US3065774A
Cited
US3224171A
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US3376695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |