US3563828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid filters
Assignee: Individual
•
Filing: 1968-06-14
•
Granted: 1971-02-16
•
Expires: 1988-06-14
Abstract
Abstract A FLUID FILTER FOR REMOVING DUST AND OTHER FOREIGN MATTER FROM AIR AND OTHER FLUIDS STREAMS HAVING A METAL FRAME OR A METAL REINFORCEMENT WHICH IS BONDED TO ONE OR MORE LAYERS OF FILTERING MATERIAL BY A COATING OF THERMOPLASTIC MATERIAL, THE COATING BEING OBTAINED BY HEATING THE FRAME OR REINFORCEMENT AND BRINGING IT INTO CONTACT WITH THERMOPLASTIC MATERIAL IN POWDER FORM, WHEREUPON THE POWDER MELTS AND THE FILTERING MATERIAL IS PRESSED AGAINST THE COATING WHILE IT IS STILL MOLTEN.
Inventors
- 👤 Dennis A G Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:24
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/04; B; B01; B01D; B01D46/00; B01D46/10; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |