US3883440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid developer for electrophotograph
Assignee: Fujifilm Holdings Corp
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Filing: 1973-06-15
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Granted: 1975-05-13
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Expires: 1993-06-15
Abstract
Abstract WHEREIN R1 and R2 each represents -H or -CH3, X represents COOCnH2n 1 (6 < OR = n < OR = 20), and Y represents -CONHCH2OH, CONHCH2OCH3, -CONHCH2OC2H5, -CONHCH2OC3H7, -CONHCH2OC4H9, CONHCH2OC5H11 A stable liquid developer for electrophotography contains in a carrier having high electric resistance and low dielectric constant a toner prepared by graft polymerizing the additionpolymerizable compound shown by the following formula (I), the addition-polymerizable compound shown by the following formula (II), and pigment particles;
Inventors
- 👤 Yasuo Tamai
- 👤 Sadao Osawa
- 👤 Satoru Honjo
- 👤 Akira Umehara
- 👤 Masaya Yamamoto
- 👤 Nobuo Tsuji
- 👤 Naomitsu Takashina
- 👤 Wakio Nagashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:59
CPC Classifications
C; C08; C08F; C08F292/00; G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13; G03G9/133
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
58 words
A LIQUID DEVELOPER FOR ELECTROPHOTOGRAPHY COMPRISING A CARRIER LIQUID HAVING AN ELECTRIC RESISTANCE HIGHER THAN ABOUT 10**10 $.M. AND A DIELECTRIC CONSTANT LESS THAN ABOUT 3, SAID CARRIER LIQUID HAVING DISPERSED THEREIN A TONER PREPARED BY GRAFT POLYMERIZING THE ADDITION POLYMERIZABLE COMPOUND REPRESENTED BY FORMULA (I) AND THE ADDITION POLYMERIZABLE COMPOUND REPRESENTED BY FORMULA (II) ONTO PIGMENT PARTICLES;
Claim 2
Dependent Claim
58 words
A LIQUID DEVELOPER FOR ELECTROPHOTOGRAPHY COMPRISING A CARRIER LIQUID HAVING AN ELECTRIC RESISTANCE HIGHER THAN ABOUT 10**10 $.M. AND A DIELECTRIC CONSTANT LESS THAN ABOUT 3, SAID CARRIER LIQUID HAVING DISPERSED THEREIN A TONER PREPARED BY GRAFT POLYMERIZING THE ADDITION POLYMERIZABLE COMPOUND REPRESENTED BY FORMULA (I) AND THE ADDITION POLYMERIZABLE COMPOUND REPRESENTED BY FORMULA (II) ONTO PIGMENT PARTICLES;
Claim 3
Dependent Claim
18 words
The liquid developer for electrophotography as set forth in claim 1 in which the pigment is carbon black.
Claim 4
Dependent Claim
23 words
The liquid developer for electrophotography as set forth in claim 1 wherein the size of the pigment particles is less than 0.4 micron.
Claim 5
Dependent Claim
35 words
The liquid developer for electrophotography as set forth in claim 1 wherein from about 0.5 to about 10 parts by weight of the toner is present per 1000 parts by weight of the carrier liquid.
Claim 6
Dependent Claim
61 words
The liquid developer for electrophotography as set forth in claim 1 wherein the pigment particles are present in an amount less than about 6 parts by weight per 1 part by weight of the total amount of the compound of formula (I) and the compound of formula (II), but in an amount greater than about 0.2 parts by weight, same basis.
Claim 7
Dependent Claim
32 words
The liquid developer for electrophotography as set forth in claim 1 in which the formula (I) addition polymerizable compound is lauryl methacrylate and the formula (II) addition polymerizable compound is diacetone acrylamide.
Claim 8
Dependent Claim
29 words
The liquid developer as set forth in claim 1 in which the formula (I) addition polymerizable compound is lauryl methacrylate and the formula (II) addition polymerizable compound is methoxymethylacrylamide.
Claim 9
Dependent Claim
29 words
The liquid developer as set forth in claim 1 in which the formula (I) addition polymerizable compound is lauryl methacrylate and the formula (II) addition polymerizable compound is N-methylolacrylamide.
Claim 10
Dependent Claim
29 words
The liquid developer as set forth in claim 1 in which the formula (I) addition polymerizable compound is lauryl methacrylate and the formula (II) addition polymerizable compound is morpholinomethylacrylamide.
Claim 11
Dependent Claim
29 words
The liquid developer as set forth in claim 1 in which the formula (I) addition polymerizable compound is lauryl methacrylate and the formula (II) addition polymerizable compound is acryloylmorpholine.
Claim 12
Dependent Claim
24 words
The liquid developer for electrophotography as set forth in claim 1 where at least 90 percent by weight of said pigment is carbon black.
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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |