US3406504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined gas moving and gas cleaning apparatus
Assignee: American Air Filter Co Inc
•
Filing: 1966-12-13
•
Granted: 1968-10-22
•
Expires: 1986-12-13
Abstract
No abstract record available.
Inventors
- 👤 Stig G Sylvan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:06
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; B01D46/12; F; F01; F01M; F01M13/00; F01M13/04; F01M2013/0422
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA538038A
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GB190204918A
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US1794447A
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US2031734A
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GB449765A
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US2021437A
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US2482642A
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US3058720A
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US3309867A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-22 | 1972-04-22 | 1972-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-22 | 1976-04-22 | 1976-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-22 | 1980-04-22 | 1980-10-22 | $7700.00 | Window Closed / Lapsed |