US3309848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filtration
Assignee: Individual
•
Filing: 1964-06-19
•
Granted: 1967-03-21
•
Expires: 1984-06-19
Abstract
No abstract record available.
Inventors
- 👤 Schwab Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:36
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D2275/00; B01D2275/20; B01D2275/207
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A FILTER UNIT FOR USE IN SEPARATING ENTRAINED PARTICLES CARRIED BY AN AIR STREAM COMPRISING: (1) A HOLLOW OUTER MEMBER FORMED OF AIR-PERMEABLE FILTERING MATERIAL HAVING A TRIANGULAR UPSTREAM OPEN END AND A DOWNSTREAM CLOSED END, THE MEMBER CONSISTING OF THREE WALL PORTIONS WHICH TAPER FROM THE UPSTREAM END TO THE DOWNSTREAM CLOSED END, THE UPSTREAM OPEN END COMPRISING A TRIANGULAR BASE HAVING RESILIENT LEGS WHICH ARE OUTWARDLY AND COPLANARLY BOWED, THE WALL PORTIONS BEING AFFIXED TO THE BASE; AND
Claim 2
Dependent Claim
80 words
A FILTER UNIT FOR USE IN SEPARATING ENTRAINED PARTICLES CARRIED BY AN AIR STREAM COMPRISING: (1) A HOLLOW OUTER MEMBER FORMED OF AIR-PERMEABLE FILTERING MATERIAL HAVING A TRIANGULAR UPSTREAM OPEN END AND A DOWNSTREAM CLOSED END, THE MEMBER CONSISTING OF THREE WALL PORTIONS WHICH TAPER FROM THE UPSTREAM END TO THE DOWNSTREAM CLOSED END, THE UPSTREAM OPEN END COMPRISING A TRIANGULAR BASE HAVING RESILIENT LEGS WHICH ARE OUTWARDLY AND COPLANARLY BOWED, THE WALL PORTIONS BEING AFFIXED TO THE BASE; AND
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-20 | 1970-09-19 | 1971-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-20 | 1974-09-19 | 1975-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-20 | 1978-09-19 | 1979-03-21 | $7700.00 | Window Closed / Lapsed |