US3769043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treating solution for planographic printing plates
Assignee: Ricoh Co Ltd
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Filing: 1971-05-20
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Granted: 1973-10-30
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Expires: 1991-05-20
Abstract
Abstract A treating solution for planographic printing plates, which consists essentially of an aqueous solution containing dissolved therein at least one iron-cyano-complex such as ammonium ferrocyanide, sodium ferrocyanide, sodium ferricyanide, potassium ferrocyanide and potassium ferricyanide, at least one heteropolyacid such as phosphorus vanadate and ammonium or alkali metal salts of said acids and at least one phosphate such as diammonium hydrogen phosphate, sodium dihydrogen phosphate and dipotassium hydrogen phosphate, the balance, apart from impurities, being water.
Inventors
- 👤 T Morishima
- 👤 R Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:31
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
67 words
A treating solution according to claim 1, wherein the concentration of said iron-cyano-complex is in the range of from about 0.5 to about 10 percent by weight, the concentration of said material (b) is in the range of from about 0.05 to about 5 percent by weight, and the concentration of said phosphate is in the range of from about 1.0 to about 10 percent by weight.
Claim 2
Dependent Claim
182 words
A treating solution for planographic printing plates, which consists essentially of an aqueous solution of (a) from about 0.5 to about 20 percent by weight of at least one iron-cyano-complex selected from the group consisting of sodium ferrocyanide, sodium ferricyanide, potassium ferrocyanide, potassium ferricyanide, ammonium ferricyanide and ammonium ferrocyanide, (b) from about 0.05 to about 10 percent by weight of at least one material selected from the group consisting of phosphomolybdic acid, phosphotungstic acid, phosphovanadic acid, ammonium salts of said acids, alkali metal salts of said acids, sodium molybdate and sodium tungstate, (c) from about 1.0 to about 20 percent by weight of at least one phosphate selected from the group consisting of disodium hydrogen phosphate, sodium di-hydrogen phosphate, dipotassium hydrogen phosphate, potassium dihydrogen phosphate, diammonium hydrogen phosphate and ammonium dihydrogen phosphate; and (d) from about 1.0 to about 20 percent by weight of at least one compound selected from the group consisting of gum arabic, sodium alginate, ester of alginic acid-propylene glycol, propylene glycol, carboxymethyl cellulose, dextrin, polyacrylic acid and glycerine, the balance of said solution, apart from impurities, being water.
Claim 3
Dependent Claim
86 words
A treating solution according to claim 3, wherein the concentration of said iron-cyano-complex is in the range of from about 0.5 to about 10 percent by weight, the concentration of said material (b) is in the range of from about 0.05 to about 5 percent by weight, the concentration of said phosphate is in the range of from about 1.0 to about 10 percent by weight, and the concentration of said compound is in the range of from about 1.0 to about 10 percent by weight.
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |