Filter for electrostatographic developer
Abstract
Abstract IMPROVED FILTER FOR SEPARATING AN ELECTROSTATOGRPAHIC DEVELOPER MATERIAL (TONER) WHEREIN THE FILTER MATERIAL IS COATED WITH A PLASTICIZER FOR THE TONER. THE FILTER IS PREFERABLY FORMED FROM FIBER GLASS AND IS COMPRISED, IN THE DIRECTION OF FLOW, OF A LOOSELY ASSEMBLED WEB OR MAT OF INCREASING DENSITY AND A LOOSELY ASSEMBLED WEB OR MAT OF SUBSTANTIALLY UNIFORM DENSITY. THE FILTER IS GENERALLY EMPLOYED IN THE CLEANING STATION OF A XEROGRAPHIC MACHINE AND IS EMPLOYED TO REMOVE TONER PARTICLES SUSPENDED IN AN AIR STREAM. THE FILTER BAG HAS BEEN FOUND TO HAVE A USEFUL LIFE OF 18,000 COPIES OR MORE, AS COMPARED TO CONVENTIONAL FILTER BAGS WHICH HAVE A USEFUL LIFE OF ABOUT 4,000 COPIES.
Inventors
- 👤 Carl F Clemens
Bibliographic Details
Claims Analysis
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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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |