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US3069997A
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Apparatus for preventing exfiltration of smoke-laden air from smokeiiouse enclosures
Assignee: Julian Engineering Co
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Filing: 1961-05-22
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Granted: 1962-12-25
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Expires: 1981-05-22
Abstract
No abstract record available.
Inventors
- 👤 John A Julian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:03
CPC Classifications
A; A23; A23B; A23B4/00; A23B4/044; A23B4/052; B; B08; B08B; B08B15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2154801A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-24 | 1966-06-25 | 1966-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-24 | 1970-06-25 | 1970-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-24 | 1974-06-25 | 1974-12-25 | $7700.00 | Window Closed / Lapsed |