US3945823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatographic reversal development with developer comprising poly(p-xylene)-coated carrier particles
Assignee: Xerox Corp
•
Filing: 1973-07-19
•
Granted: 1976-03-23
•
Expires: 1993-07-19
Abstract
Abstract An electrostatographic developer mixture comprising finely divided toner particles electrostatically clinging to the surface of larger carrier beads, each of the carrier beads comprising a core particle surrounded by a thin outer layer of a poly(p-xylylene) polymer. Imaging processes of developing electrostatic latent images with the developer mixture are also disclosed.
Inventors
- 👤 Richard A. Parent
- 👤 H. Ronald Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:26
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/113; G03G9/1132; G03G9/1135; G03G9/1133
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
122 words
An electrostatographic reversal development imaging process comprising the steps of providing an electrostatographic imaging member having a recording surface, forming an electrostatic latent image on said recording surface, and contacting said electrostatic latent image with a developer mixture comprising finely-divided toner particles electrostatically clinging to the surface of carrier particles capable of generating a negative triboelectric charge when mixed with said toner particles, said carrier particles comprising more core particles having an average diameter between about 1 micron and about 1,000 microns, and said core particles being surrounded by a thin outer layer consisting of poly(p-xylylene), whereby at least a portion of said finely-divided toner particles are attracted to and deposited on said recording surface in conformance with said electrostatic latent image.
Claim 2
Dependent Claim
122 words
An electrostatographic reversal development imaging process comprising the steps of providing an electrostatographic imaging member having a recording surface, forming an electrostatic latent image on said recording surface, and contacting said electrostatic latent image with a developer mixture comprising finely-divided toner particles electrostatically clinging to the surface of carrier particles capable of generating a negative triboelectric charge when mixed with said toner particles, said carrier particles comprising more core particles having an average diameter between about 1 micron and about 1,000 microns, and said core particles being surrounded by a thin outer layer consisting of poly(p-xylylene), whereby at least a portion of said finely-divided toner particles are attracted to and deposited on said recording surface in conformance with said electrostatic latent image.
Claim 3
Dependent Claim
14 words
An electrostatographic imaging process according to claim 1 wherein said poly(p-xylylene) is a polymer.
Claim 4
Dependent Claim
14 words
An electrostatographic imaging process according to claim 1 wherein said poly(p-xylylene) is a copolymer.
Claim 5
Dependent Claim
26 words
An electrostatographic imaging process according to claim 1 wherein said thin outer layer of poly(p-xylylene) is from about 50 Angstroms to about 5 microns in thickness.
Claim 6
Dependent Claim
65 words
An electrostatographic imaging process according to claim 1 wherein said poly(p-xylylene) contains repeating units of the structures ##SPC5## wherein R and R' are nuclear substituents selected from the group consisting of alkyl, aryl, alkenyl, amino, cyano, carboxyl, alkoxy, hydroxy alkyl, carbaloxy, hydroxyl, nitro, and halogen groups which may be the same or different, and x and y are each integers from 1 to 4 inclusive.
Claim 7
Dependent Claim
32 words
An electrostatographic imaging process according to claim 5 wherein x and y are the same and R and R' are the same and said poly(p-xylylene) is a homopolymer having the structure: ##SPC6##
Claim 8
Dependent Claim
29 words
An electrostatographic imaging process according to claim 5 wherein R and R' and/or x and y are different and said poly(p-xylylene) is a copolymer having the general structure: ##SPC7##
Claim 9
Dependent Claim
14 words
An electrostatographic imaging process according to claim 1 wherein said core particles are metal.
Claim 10
Dependent Claim
13 words
An electrostatographic imaging process according to claim 8 wherein said metal is steel.
References Cited (Backward Citations)
US3395916A
Cited
US3333169A
Cited
US3627522A
Cited
US3533835A
Cited
US3507686A
Cited
US3600216A
Cited
US3632512A
Cited
US3669885A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |