US3775103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic material and process for producing same
Assignee: Fujifilm Holdings Corp
•
Filing: 1971-11-10
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Granted: 1973-11-27
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Expires: 1991-11-10
Abstract
Abstract An electrophotographic process utilizing a composite photoconductive powder comprising a closely adhered mixture of a photoconductive powder and a transparent non-photoconductive powder typically used for electrophotographic print marking.
Inventors
- 👤 S Sadamatsu
- 👤 H Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:24
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/101
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
17 words
A process as in claim 1 where said photoconductive powder particles are adhered onto said transparent particles.
Claim 2
Dependent Claim
6 words
uniformly charging said composite powder layer;
Claim 3
Dependent Claim
67 words
image exposing the uniformly charged composite powder layer to thereby obtain a first electrostatic attractive force between the composite powder and the substrate wherever the composite powder layer is exposed to light of low intensity and a second electrostatic attractive force substantially less than said first electrostatic force between the composite powder and the substrate wherever the composite powder layer is exposed to light of high intensity;
Claim 4
Dependent Claim
30 words
A process as in claim 1 where the average particle size-ratio of said photoconductive powder particles to said transparent powder particles is within the range of apProximately 1:3 through 1:3000.
Claim 5
Dependent Claim
32 words
A process as in claim 3 where the average size of said photoconductive powder particles is 0.05 - 50 microns and the average size of said transparent powder particles is 1-1000 microns.
Claim 6
Dependent Claim
44 words
applying a physical force to the powder layer to remove the less strongly attracted composite powder to thereby obtain on the substrate a composite powder image corresponding to that portion where the electrostatic force between the composite powder and the substrate is high; and
Claim 7
Dependent Claim
4 words
fixing said powder image.
Claim 8
Dependent Claim
17 words
A process as in claim 3 where substantially all of said transparent powder particles are spherical shape.
Claim 9
Dependent Claim
21 words
A process as in claim 1 wherein said transparent powder particles are substantially non-photoconductive with respect to said photoconductive powder particles.
Claim 10
Dependent Claim
31 words
A process as cliamed in claim 1 wherein said photoconductive powder is a material selected from the group consisting of selenium, cadmium sulfide, mercuric iodide, zinc oxide, titanium oxide and anthracene.
Claim 11
Dependent Claim
16 words
A process as claimed in claim 1 wherein said photoconductive powder is a photoconductive organic pigment.
Claim 12
Dependent Claim
20 words
A process as claimed in claim 1 wherein said photoconductive powder is a material which is treated with a dye.
Claim 13
Dependent Claim
32 words
A process as claimed in claim 1 wherein said transparent powder is a material selected from the group consisting of a thermoplastic resin, solvent-soluble thermosetting resin, glass, inorganic salt, and metal oxide.
Claim 14
Dependent Claim
13 words
A process as claimed in claim 10 wherein said transparent powder is dyed.
Claim 15
Dependent Claim
46 words
A process as in claim 1 wherein the light absorption coefficient of said transparent powder particles to light in the sensitive region of the photoconductive powder particles is less than 80 percent when said transparent powder particles are formed into a film of 5 microns thickness.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |