US3487929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical-type filter bypass indicator
Assignee: Aero Flow Dynamics Inc
•
Filing: 1967-05-29
•
Granted: 1970-01-06
•
Expires: 1987-05-29
Abstract
No abstract record available.
Inventors
- 👤 William J Sample
- 👤 George T Downey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:14
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/114; B01D29/50; B01D29/52; B01D29/54; B01D35/00; B01D35/14; B01D35/143; B01D35/147; B01D2201/00; B01D2201/30; B01D2201/301; B01D2201/302
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2935040A
Cited
US3080972A
Cited
US2998138A
Cited
US3052206A
Cited
US3146757A
Cited
US3154049A
Cited
US3200787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |