US3395514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter testing system and method
Assignee: MSA Safety Inc
•
Filing: 1965-10-27
•
Granted: 1968-08-06
•
Expires: 1985-10-27
Abstract
No abstract record available.
Inventors
- 👤 Robert A Bub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:57
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/523; B01D46/10; G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20; B01D2273/00; B01D2273/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US792000A
Cited
US1049789A
Cited
US2055774A
Cited
US2638688A
Cited
US2790253A
Cited
US3194056A
Cited
US3144315A
Cited
US3280538A
Cited
US3280540A
Cited
US3250063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-06 | 1972-02-05 | 1972-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-06 | 1976-02-05 | 1976-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-06 | 1980-02-05 | 1980-08-06 | $7700.00 | Window Closed / Lapsed |