US3478496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for treating exhaust gases from a stack
Assignee: Individual
•
Filing: 1967-11-13
•
Granted: 1969-11-18
•
Expires: 1987-11-13
Abstract
No abstract record available.
Inventors
- 👤 William R Keough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:53
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/04; B; B01; B01D; B01D47/00; B01D47/02; B01D47/021; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S261/00; Y10S261/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1818143A
Cited
US2698745A
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US2726853A
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US2935375A
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US2937013A
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US3239999A
Cited
US3322508A
Cited
US3317197A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |