Patent US3356498A successfully refreshed from Google Patents.
US3356498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic method comprising rinsing the imaged plate
Assignee: Dow Chemical Co
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Filing: 1964-11-09
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Granted: 1967-12-05
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Expires: 1984-11-09
Abstract
No abstract record available.
Inventors
- 👤 Clyde A Moe
- 👤 Henderson C Gillespie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:01
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/005; G03G13/00; G03G13/26; G03G13/32; G03G8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
IN THE ELECTROPHOTOGRAPHIC PREPARATION OF ETCHABLE PHOTOENGRAVING PLATES INCLUDING: (A) PROVIDING A PHOTOCONDUCTIVE COMPOSITION COMPRISING, A PHOTOCONDUCTIVE ZINC OXIDE SUSPENDED IN A CROSS-LINKING RESINOUS INSULATING BINDER COATED ON A METAL PLATE, (B) NEGATIVELY ELECTROSTATICALLY CHARGING SAID COATED PLATE, (C) EXPOSING THE CHARGE PLATE TO AN ILLUMINATED IMAGE TO FORM A LATENT ELECTROSTATIC IMAGE, (D) CONTACTING SAID LATENT IMAGE WITH A CROSS-LINKING PROMOTING CATALYST MATERIAL, (E) RINSING THE PLATE SO-CONTACTED IN A RINSING LIQUID, (F) CURING THE PLATE AT AN ELEVATED TEMPERATURE (G) REMOVING OF THE NONIMAGE AREAS AND (H) CONTACTING THE SO-TREATED PLATE WITH A POWDERLESS ETCHING BATH; THE IMPROVEMENT COMPRISING, RINSING THE CATALYST-CONTACTED PLATE WITH AN ISOPARAFFINIC HYDROCARBON LIQUID CHARACTERIZED BY A KAURIN ISOPARAFFINIC VALVE OF ABOUT 27, A FLASH POINT OF ABOUT 104*F., AND AN EVAPORATION RATE AT 100 PERCENT CONCENTRATION OF 3180 SECONDS.
Claim 2
Dependent Claim
136 words
IN THE ELECTROPHOTOGRAPHIC PREPARATION OF ETCHABLE PHOTOENGRAVING PLATES INCLUDING: (A) PROVIDING A PHOTOCONDUCTIVE COMPOSITION COMPRISING, A PHOTOCONDUCTIVE ZINC OXIDE SUSPENDED IN A CROSS-LINKING RESINOUS INSULATING BINDER COATED ON A METAL PLATE, (B) NEGATIVELY ELECTROSTATICALLY CHARGING SAID COATED PLATE, (C) EXPOSING THE CHARGE PLATE TO AN ILLUMINATED IMAGE TO FORM A LATENT ELECTROSTATIC IMAGE, (D) CONTACTING SAID LATENT IMAGE WITH A CROSS-LINKING PROMOTING CATALYST MATERIAL, (E) RINSING THE PLATE SO-CONTACTED IN A RINSING LIQUID, (F) CURING THE PLATE AT AN ELEVATED TEMPERATURE (G) REMOVING OF THE NONIMAGE AREAS AND (H) CONTACTING THE SO-TREATED PLATE WITH A POWDERLESS ETCHING BATH; THE IMPROVEMENT COMPRISING, RINSING THE CATALYST-CONTACTED PLATE WITH AN ISOPARAFFINIC HYDROCARBON LIQUID CHARACTERIZED BY A KAURIN ISOPARAFFINIC VALVE OF ABOUT 27, A FLASH POINT OF ABOUT 104*F., AND AN EVAPORATION RATE AT 100 PERCENT CONCENTRATION OF 3180 SECONDS.
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) | 1970-12-04 | 1971-06-05 | 1971-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-04 | 1975-06-05 | 1975-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-04 | 1979-06-05 | 1979-12-05 | $7700.00 | Window Closed / Lapsed |