US4176078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Field dependent toner having chrome complex coated magnetic particles
Assignee: Xerox Corp
•
Filing: 1977-06-02
•
Granted: 1979-11-27
•
Expires: 1997-06-02
Abstract
Abstract A method of coating pigment particles such as magnetite with a fatty acid chrome complex is disclosed. The magnetite pigments coated by this process are found to be particularly suitable for use in formation of field dependent toners.
Inventors
- 👤 Chin H. Lu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:48
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09783; G03G9/083; G03G9/0839; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/104
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
65 words
A field dependent toner comprising a resin coated magnetic particles wherein the surface of said particles is represented by the formula ##STR6## wherein R represents a fatty acid radical of between 7 and 17 carbon atoms and Y represents negative polar surface groups of the magnetic particles, said toner having a resistivity greater than about 10 12 ohm-cm at fields up to about 100 volts/cm.
Claim 2
Dependent Claim
65 words
A field dependent toner comprising a resin coated magnetic particles wherein the surface of said particles is represented by the formula ##STR6## wherein R represents a fatty acid radical of between 7 and 17 carbon atoms and Y represents negative polar surface groups of the magnetic particles, said toner having a resistivity greater than about 10 12 ohm-cm at fields up to about 100 volts/cm.
Claim 3
Dependent Claim
19 words
The toner of claim 1 wherein the coating comprises about 1 to 10 weight percent of the magnetic particles.
Claim 4
Dependent Claim
27 words
The toner of claim 1 wherein the coated magnetic particle comprises coated magnetite and said magnetite comprises about 40 to about 70 weight percent of the toner.
Claim 5
Dependent Claim
19 words
The toner of claim 1 wherein R consists of C 17 H 35 or C 13 H 27 .
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) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |