US3833365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic power coating method combined with an electrophotographic process
Assignee: Fujifilm Holdings Corp
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Filing: 1972-06-30
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Granted: 1974-09-03
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Expires: 1992-06-30
Abstract
Abstract An electrostatic powder coating method comprising; EXPOSING A CHARGED PHOTOCONDUCTIVE TONER LAYER FORMED ON AN ELECTRICALLY CONDUCTIVE SUBSTRATE TO AN OPTICAL IMAGE; SELECTIVELY REMOVING THE IRRADIATION DISCHARGED TONER PARTICLES FROM SAID TONER LAYER AT IRRADIATED AREAS TO FORM A TONER IMAGE CORRESPONDING TO SAID OPTICAL IMAGE; AND THEN, WHILE THE REMAINING CHARGED TONER LAYER STILL RETAINS A SUFFICIENT AMOUNT OF CHARGE, ELECTROSTATICALLY SPRAYING A SECOND POWDER HAVING THE SAME CHARGE POLARITY AS THAT OF SAID TONER LAYER OVER THE TONER IMAGE BEARING SURFACE, WHEREBY SAID SECOND POWDER IS PREFERENTIALLY DEPOSITED ON THE IRRADIATED AREAS OF SAID IMAGE BEARING SURFACE, IS DISCLOSED.
Inventors
- 👤 K Hiwano
- 👤 M Fukagawa
- 👤 S Matsumoto
- 👤 S Honjo
- 👤 M Iwasa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:07
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/34; G03G15/342; G03G9/00; G03G9/08; G03G9/09; G03G9/0926; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/101
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
16 words
The method as described in claim 1, wherein said photoconductive toner layer contains photoconductive zinc oxide.
Claim 2
Dependent Claim
45 words
The method as described in claim 1, wherein said second powder is a powder paint comprising a pigment in a resinous material selected from the group consisting of an epoxide resin, a polyamide resin, a polyester resin, a polyvinylchloride resin, and a cellulose acetate butyrate.
Claim 3
Dependent Claim
19 words
The method as described in claim 1, wherein said method additionally comprises fusing the particles of said second powder.
Claim 4
Dependent Claim
41 words
The method as described in claim 1, wherein said second powder is a powder paint comprising a resinous material selected from the group consisting of an epoxide resin, a polyamide resin, a polyester resin, a polyvinylchloride resin and cellulose acetate butyrate.
Claim 5
Dependent Claim
23 words
The method as described in claim 1, wherein said removal of said irradiated discharged toner particles is by air blowing or by vibrating.
Claim 6
Dependent Claim
30 words
The method as described in claim 1, wherein said substrate is an uncoated metal plate and said second powder is a powder paint comprising a polyester or an epoxide resin.
Claim 7
Independent Claim
185 words
A method of improving the smoothness of the cuts in a flame-cut metal pattern which comprises exposing a charged photoconductive toner layer formed on an electrically conductive substrate having a range of conductivity not less than 10 10(ohm square) 1 to an optical image; selectively removing the irradiation discharged toner particles from said toner layer at irradiated areas to form a toner image corresponding to said optical image; and then, while the remaining charged toner layer still retaIns a sufficient amount of charge, electrostatically spraying a second electrically insulating powder having the same electrostatic charge polarity as that of said toner layer over the toner image bearing surface, said second powder retaining its charge when irradiated by light which can dissipate the charge in said photoconductive toner, whereby said second powder is preferentially deposited on the irradiated areas of said image bearing surface; discharging the charged toner particles of said charged toner layer by uniform irradiation; removing said discharged toner particles from said substrate and flame cutting said substrate along the image areas formed by the removal of said discharged toner particles from said substrate.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |