US3537241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas filter bag structure
Assignee: American Air Filter Co Inc
•
Filing: 1969-04-21
•
Granted: 1970-11-03
•
Expires: 1989-04-21
Abstract
No abstract record available.
Inventors
- 👤 John W Wiegel
- 👤 Paul L Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:31
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; Y; Y10; Y10S; Y10S493/00; Y10S493/941
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3190059A
Cited
US3289394A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |