US3520114A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vortex air cleaner assembly having uniform particle removal efficiency throughout the array of air cleaners
Assignee: Pall Corp
•
Filing: 1968-06-28
•
Granted: 1970-07-14
•
Expires: 1988-06-28
Abstract
No abstract record available.
Inventors
- 👤 David B Pall
- 👤 Robert I Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:16
CPC Classifications
B; B04; B04C; B04C3/00; B04C3/04; Y; Y10; Y10S; Y10S55/00; Y10S55/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA623072A
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US1338143A
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US1372714A
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GB511510A
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US2323707A
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FR1019674A
Cited
US2671560A
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US2847087A
Cited
US3264806A
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US3071915A
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US3165390A
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US3360909A
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US3362155A
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US3401506A
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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) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |