US3980577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diphenylmethane electrophotographic liquid developer
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1973-10-18
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Granted: 1976-09-14
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Expires: 1993-10-18
Abstract
Abstract An electrophotographic developer containing a lake of a diphenylmethane color of the formula:
Inventors
- 👤 Seiji Hotta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 22:49
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/09; G03G9/0906; G03G9/0912; G03G9/12; G03G9/122
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
81 words
An electrophotographic liquid developer comprising (1) a carrier liquid having above 10 10 Ω cm of volume resistivity, (2) a resinous, waxy or varnish substance selected from the group consisting of oil-modified alkyd resins, rosin-modified phenolformaldehyde resins, polyhydric alcohol esters of hydrogenated rosins, polyacryl ester resins, polymethacryl ester resins, polyvinyl acetate and polystyrene, and (3) a lake of the diphenylmethane C.I. Basic Yellow No. 2 or No. 3 having, respectively, the following formulae: Yellow No. 2: ##SPC4## Yellow No. 3: ##SPC5##2.
Claim 2
Dependent Claim
81 words
An electrophotographic liquid developer comprising (1) a carrier liquid having above 10 10 Ω cm of volume resistivity, (2) a resinous, waxy or varnish substance selected from the group consisting of oil-modified alkyd resins, rosin-modified phenolformaldehyde resins, polyhydric alcohol esters of hydrogenated rosins, polyacryl ester resins, polymethacryl ester resins, polyvinyl acetate and polystyrene, and (3) a lake of the diphenylmethane C.I. Basic Yellow No. 2 or No. 3 having, respectively, the following formulae: Yellow No. 2: ##SPC4## Yellow No. 3: ##SPC5##2.
Claim 3
Dependent Claim
12 words
The developer according to claim 1, wherein the diphenylmethane color is ##SPC6##
Claim 4
Dependent Claim
12 words
The developer according to claim 1, wherein the diphenylmethane color is ##SPC7##
Claim 5
Dependent Claim
32 words
The developer according to claim 1, wherein the lake is a member selected from the group consisting of tannic acid, gallic acid, silicomolybdic acid, phosphomolybdic acid, phosphotungstic acid and phosphotungstomolybdic acid lakes.
Claim 6
Dependent Claim
34 words
A process for preparing the electrophotographic developer of claim 1, which comprises dispersing the lake defined in claim 1 in said carrier and mixing the resulting dispersion with said resinous, waxy or varnish substance.
References Cited (Backward Citations)
US3325409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |