Patent US3472001A successfully refreshed from Google Patents.
US3472001A
Expired / Lapsed
US
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Gas intake device
Assignee: American Air Filter Co Inc
•
Filing: 1967-11-01
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Granted: 1969-10-14
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Expires: 1987-11-01
Abstract
No abstract record available.
Inventors
- 👤 Dwight M Mcmakin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:46
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/16; B; B01; B01D; B01D50/00; F04B39/0027; F04B39/0055
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1966787A
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US2091019A
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US2161027A
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US2112608A
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US2198305A
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US2381705A
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US2407194A
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US2588612A
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US3069848A
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US3279883A
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US3352778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |