Patent US3909383A successfully refreshed from Google Patents.
US3909383A
Expired / Lapsed
US
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Cleaning process
Assignee: Xerox Corp
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Filing: 1973-03-12
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Granted: 1975-09-30
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Expires: 1993-03-12
Abstract
Abstract Insulating liquids contaminated with suspended particles and dissolved material are regenerated by initially removing the suspended particles by triboelectric electric filtration and thereafter removing the dissolved material by adsorption of the dissolved material onto a suitable surface.
Inventors
- 👤 Masamichi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:15
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/0088; B; B01; B01D; B01D43/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
133 words
A METHOD FOR SEPARATING SUSPENDED SOLID PARTICLES AND DISSOLVED ABSORBATE MATERIAL FROM AN INSULATING LIQUID WHEREIN THE LIQUID IS CONTAMINATED WITH TONER PARTICLES, DYES, FIXING AGENTS, STABILIZERS OR ELECTRIC CHARGE REGULATORS DEPOSITED IN THE LIQUID BY CONTACTING IT WITH A XEROGRAPHIC IMAGING SURFACE AFTER SAID SURFACE HAS BEEN DEVELOPED BY CONTACTING IT WITH A LIQUID DEVELOPER COMPRISING REMOVING SAID SUSPENDED PARTICLES FROM SAID INSULATING LIQUID BY CONTACTING SAID INSULATING LIQUID AND SAID SUSPENDED SOLID PARTICLES WITH A PARTICULATE FILTERING MATERIAL OF PARTICLE SIZE LESS THAN 1 MM CAPABLE OF ACQUIRING AN ELECTRICAL CHARGE UPON CONTACT WITH SAID INSULATING LIQUID, SAID ELECTRICAL CHARGE HAVING A POLARITY OPPOSITE THE POLARITY OF THE ELECTRICAL CHARGE ACQUIRED BY SAID SUSPENDED PARTICLES IN SAID INSULATING LIQUID WHEREBY SAID SUSPENDEDED PARTICLES ARE ATTRACTED TO AND DEPOSITON SAID FILTERING MATERIAL.
Claim 2
Independent Claim
133 words
A METHOD FOR SEPARATING SUSPENDED SOLID PARTICLES AND DISSOLVED ABSORBATE MATERIAL FROM AN INSULATING LIQUID WHEREIN THE LIQUID IS CONTAMINATED WITH TONER PARTICLES, DYES, FIXING AGENTS, STABILIZERS OR ELECTRIC CHARGE REGULATORS DEPOSITED IN THE LIQUID BY CONTACTING IT WITH A XEROGRAPHIC IMAGING SURFACE AFTER SAID SURFACE HAS BEEN DEVELOPED BY CONTACTING IT WITH A LIQUID DEVELOPER COMPRISING REMOVING SAID SUSPENDED PARTICLES FROM SAID INSULATING LIQUID BY CONTACTING SAID INSULATING LIQUID AND SAID SUSPENDED SOLID PARTICLES WITH A PARTICULATE FILTERING MATERIAL OF PARTICLE SIZE LESS THAN 1 MM CAPABLE OF ACQUIRING AN ELECTRICAL CHARGE UPON CONTACT WITH SAID INSULATING LIQUID, SAID ELECTRICAL CHARGE HAVING A POLARITY OPPOSITE THE POLARITY OF THE ELECTRICAL CHARGE ACQUIRED BY SAID SUSPENDED PARTICLES IN SAID INSULATING LIQUID WHEREBY SAID SUSPENDEDED PARTICLES ARE ATTRACTED TO AND DEPOSITON SAID FILTERING MATERIAL.
Claim 3
Dependent Claim
18 words
A method according to claim 1 including removing said suspended particles from said insulating liquid by triboelectric filtration.
Claim 4
Dependent Claim
42 words
A method according to claim 1 wherein said filtering material comprises a layer of filtering material particles having a particle size larger than said suspended particles and containing voids sufficiently large to permit free passage of said suspended particles through said layer.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein the suspended particles have a colloidal size of less than about 1 micron.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein the suspended solid particles are in the shape of spheres, cylinders, plateletts or granules.
Claim 7
Dependent Claim
30 words
The method of claim 1 wherein the suspended solid particles are made up of polyvinylchloride, polyethylene, polyvinylidene chloride, fluorinated resins or nitrocellulose and the insulating liquid is a mineral oil.
Claim 8
Dependent Claim
21 words
The method of claim 1 wherein the suspended solid particles are made up of protein, a polyamide resin, ethylcellulose or glass.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |