US3309990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of printing plates
Assignee: Azoplate Corp
•
Filing: 1961-12-26
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Granted: 1967-03-21
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Expires: 1981-12-26
Abstract
No abstract record available.
Inventors
- 👤 Klupfel Kurt-Walter
- 👤 Tomanek Martha
- 👤 Endermann Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:47
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0622; G03G5/0624; G03G5/0627; B; B41; B41N; B41N3/00; B41N3/08; G03G13/00; G03G13/26; G03G13/28; G03G5/05; G03G5/0525; G03G5/0635; G03G5/0664; G03G5/0666; G03G5/08; G03G5/087
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A PROCESS FOR THE PREPARATION OF A PRINTING PLATE WHICH COMPRISES TREATING A PHOTOELECTRICALLY CONDUCTIVE INSULATING LAYER, CONTAINING AT LEAST ONE INORGANIC PHOTOSEMICONDUCTOR AND HAVING A DEVELOPED AND FIXED ELECTROSTATIC IMAGE THEREON, WITH AN AQUEOUS SOLUTION OF AT LEAST ONE SALT SELECTED FROM THE GROUP CONSISTING OF FERROCYANIDES AND FERRICYANIDES, IN ADMIXTURE WITH POLYVINYL PHOSPHONIC ACID WHEREBY HYDROPHILIC PROPERTIES ARE IMPARTED TO THE IMAGE-FREE AREAS OF THE LAYER.
Claim 2
Dependent Claim
68 words
A PROCESS FOR THE PREPARATION OF A PRINTING PLATE WHICH COMPRISES TREATING A PHOTOELECTRICALLY CONDUCTIVE INSULATING LAYER, CONTAINING AT LEAST ONE INORGANIC PHOTOSEMICONDUCTOR AND HAVING A DEVELOPED AND FIXED ELECTROSTATIC IMAGE THEREON, WITH AN AQUEOUS SOLUTION OF AT LEAST ONE SALT SELECTED FROM THE GROUP CONSISTING OF FERROCYANIDES AND FERRICYANIDES, IN ADMIXTURE WITH POLYVINYL PHOSPHONIC ACID WHEREBY HYDROPHILIC PROPERTIES ARE IMPARTED TO THE IMAGE-FREE AREAS OF THE LAYER.
References Cited (Backward Citations)
US2186945A
Cited
US2186946A
Cited
US2988988A
Cited
US3037861A
Cited
US2997387A
Cited
US3211686A
Cited
US3108535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-20 | 1970-09-19 | 1971-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-20 | 1974-09-19 | 1975-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-20 | 1978-09-19 | 1979-03-21 | $7700.00 | Window Closed / Lapsed |