US3884825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Imaging composition
Assignee: Xerox Corp
•
Filing: 1972-08-03
•
Granted: 1975-05-20
•
Expires: 1992-08-03
Abstract
Abstract An electrostatographic developing material comprising particles, said particles including finely divided electroscopic toner material and a minor proportion based on the weight of said toner material of at least one finely divided compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, the metal and ammonium salts thereof; and a method of electrostatographic development employing said developing material.
Inventors
- 👤 Nero R Lindblad
- 👤 Gordon E Johnson
- 👤 James H Sharp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:51
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09783; G03G9/087; G03G9/08742
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
79 words
A DEVELOPER COMPOSITION COMPRISING PARTICLES, SAID PARTICLES INCLUDING FINELY DIVIDED DISCRETE PARTICLES HAVING A SIZE OF LESS THAN ABOUT 30 MICRONS OF ELECTROSTATOGRAPHIC ELECTROSCOPIC TONER MATERIAL AND A MINOR PROPORTION BASED UPON THE WEIGHT OF SAID TONER MATERIAL OF DISCRETE PARTICLES HAVING A SIZE OF FROM ABOUT 0.5 TO ABOUT 20 MICRONS OF AT LEAST ONE FINELY DIVIDED, SOLID ADDITIVE COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHTHALIC ACID, ISOPHTHALIC ACID, TEREPHTHALIC ACID, THE METAL AND AMMONIUM SALTS THEREOF.
Claim 2
Dependent Claim
79 words
A DEVELOPER COMPOSITION COMPRISING PARTICLES, SAID PARTICLES INCLUDING FINELY DIVIDED DISCRETE PARTICLES HAVING A SIZE OF LESS THAN ABOUT 30 MICRONS OF ELECTROSTATOGRAPHIC ELECTROSCOPIC TONER MATERIAL AND A MINOR PROPORTION BASED UPON THE WEIGHT OF SAID TONER MATERIAL OF DISCRETE PARTICLES HAVING A SIZE OF FROM ABOUT 0.5 TO ABOUT 20 MICRONS OF AT LEAST ONE FINELY DIVIDED, SOLID ADDITIVE COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHTHALIC ACID, ISOPHTHALIC ACID, TEREPHTHALIC ACID, THE METAL AND AMMONIUM SALTS THEREOF.
Claim 3
Dependent Claim
21 words
The developing material of claim 1 wherein the additive is the metal salt of phthalic acid, isophthalic acid, or terephthalic acid.
Claim 4
Dependent Claim
39 words
The developing material of claim 2 wherein the additive is selected from the group consisting of an alkali metal salt, an alkaline earth metal salt, a zinc, cadmium, aluminum, Fe , cobalt, lead, silver, Cu , and nickel salt.
Claim 5
Dependent Claim
16 words
The developing material of claim 3 wherein the additive is the sodium salt of terephthalic acid.
Claim 6
Dependent Claim
16 words
The developing material of claim 3 wherein the additive is the calcium salt of terephthalic acid.
Claim 7
Dependent Claim
21 words
The developing material of claim 1 wherein the additive is an ammonium salt of phthalic acid, isophthalic acid or terephthalic acid.
Claim 8
Dependent Claim
12 words
The developing material of claim 1 wherein said additive is terephthalic acid.
Claim 9
Dependent Claim
12 words
The developing material of claim 1 wherein said additive is isophthalic acid.
Claim 10
Dependent Claim
12 words
The developing material of claim 1 wherein said additive is phthalic acid.
Claim 11
Dependent Claim
31 words
The developing material of claim 1 wherein said developing material comprises from about 0.01 percent to about 10 percent by weight of said additive based on the weight of said toner.
Claim 12
Dependent Claim
31 words
The developing material of claim 1 wherein said developing material comprises from about 0.1 percent to about 4 percent by weight of said additive based on the weight of said toner.
Claim 13
Dependent Claim
30 words
The developing material of claim 1 including from 10-1000 parts by weight of carrier particles per part of toner, said carrier particles being larger than said finely divided toner material.
Claim 14
Dependent Claim
65 words
A developer composition comprising particles, said particles including finely divided discrete particles having a size of less than about 30 microns of electrostatographic electroscopic toner material and from about 0.1 to about 10 percent by weight based upon the weight of said toner material of discrete, finely divided, solid additive particles of terephthalic acid having a size of from about 0.5 to about 20 microns.
Claim 15
Dependent Claim
65 words
A developer composition comprising particles, said particles including finely divided discrete particles having a size of less than about 30 microns of electrostatographic electroscopic toner material and from about 0.1 to about 10 percent by weight based upon the weight of said toner material of discrete, finely divided, solid additive particles of terephthalic acid having a size of from about 0.5 to about 20 microns.
References Cited (Backward Citations)
US2940934A
Cited
US2893976A
Cited
US3236639A
Cited
US3262806A
Cited
US3510338A
Cited
US3655374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |