US4073980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemically treated carrier particles for use in electrophotography
Assignee: AB Dick Co
•
Filing: 1976-09-29
•
Granted: 1978-02-14
•
Expires: 1996-09-29
Abstract
Abstract Carrier particles for use in an electrophotographic process are prepared by applying a mixture of a perfluoro acid and molybdenum disulfide to the surface of the carrier particle. The resulting carriers have a very thin and effective film deposited on the surface thereof and are long lived and abrasion resistant.
Inventors
- 👤 Virgil W. Westdale
- 👤 John Novotny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:17
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/113; G03G9/1138; G03G9/1139; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2996
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
A carrier for use in electrophotographic development of latent electrostatic images capable of inducing an electrostatic charge in a toner mixed therewith with comprises a member selected from the group consisting of metallic particles and siliceous particles to the surface of which is adhered a mixture of a metallic sulfide selected from the group consisting of molybdenum disulfide, tungsten disulfide and titanium disulfide and a member selected from the group consisting of perfluorinated and substantially perfluorinated carboxylic acids containing from 3 to 18 carbon atoms and salts, esters and amides thereof, said sulfide and acid being present in a ratio by weight of sulfide to acid of about 0.2:1 to 5:1.
Claim 2
Dependent Claim
111 words
A carrier for use in electrophotographic development of latent electrostatic images capable of inducing an electrostatic charge in a toner mixed therewith with comprises a member selected from the group consisting of metallic particles and siliceous particles to the surface of which is adhered a mixture of a metallic sulfide selected from the group consisting of molybdenum disulfide, tungsten disulfide and titanium disulfide and a member selected from the group consisting of perfluorinated and substantially perfluorinated carboxylic acids containing from 3 to 18 carbon atoms and salts, esters and amides thereof, said sulfide and acid being present in a ratio by weight of sulfide to acid of about 0.2:1 to 5:1.
Claim 3
Dependent Claim
31 words
A carrier according to claim 1 wherein said mixture of sulfide and acid is present in a concentration of about from 0.005 to 0.75% based on the weight of said particles.
Claim 4
Dependent Claim
21 words
A carrier according to claim 1 wherein said sulfide and acid are present in a ratio of about 2:1 to 3:1.
Claim 5
Dependent Claim
13 words
A carrier according to claim 1 wherein said acid is perfluoro octanoic acid.
Claim 6
Dependent Claim
14 words
A carrier according to claim 1 wherein said electrostatic charge is of positive polarity.
Claim 7
Dependent Claim
10 words
A carrier according to claim 1 said particles are non-magnetic.
Claim 8
Dependent Claim
10 words
A carrier according to claim wherein said particles are magnetic.
Claim 9
Dependent Claim
11 words
A carrier according to claim 1 wherein said particles are iron.
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) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |