Patent US3531931A successfully refreshed from Google Patents.
US3531931A
Expired / Lapsed
US
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Air pollution control device
Assignee: JOHN S CARUSO
•
Filing: 1968-02-02
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Granted: 1970-10-06
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Expires: 1988-02-02
Abstract
No abstract record available.
Inventors
- 👤 John S Caruso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:50
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/30; F01N13/00; F01N13/009; F01N13/0097; F01N3/02; F01N3/021; F01N2230/00; F01N2230/02; F01N2270/00; F01N2330/00; F01N2330/10; F01N2470/00; F01N2470/10; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
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) | 1973-10-05 | 1974-04-06 | 1974-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-05 | 1978-04-06 | 1978-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-05 | 1982-04-06 | 1982-10-06 | $7700.00 | Window Closed / Lapsed |