Patent US3393497A successfully refreshed from Google Patents.
US3393497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas exhaust and cleaning system
Assignee: Individual
•
Filing: 1965-05-05
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Granted: 1968-07-23
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Expires: 1985-05-05
Abstract
No abstract record available.
Inventors
- 👤 Frank M Donnelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:41
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/20; Y; Y10; Y10S; Y10S55/00; Y10S55/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1939248A
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US1981549A
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US2162152A
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GB486585A
Cited
US2363437A
Cited
US2613786A
Cited
US2804171A
Cited
US2889836A
Cited
US3021777A
Cited
US2937712A
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US3324629A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |