US2900180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cupola gas receiving and cooling systems
Assignee: American Air Filter Co Inc
•
Filing: 1956-06-08
•
Granted: 1959-08-18
•
Expires: 1976-06-08
Abstract
No abstract record available.
Inventors
- 👤 Raymond C Ortgies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:07
CPC Classifications
F; F27; F27B; F27B1/00; F27B1/10; F27B1/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US132974A
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US374190A
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US792735A
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US1330972A
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US1746904A
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US1872569A
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US2531344A
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FR1006172A
Cited
US2771290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |