US3368484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper offset master
Assignee: Kelco Co
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Filing: 1966-04-04
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Granted: 1968-02-13
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Expires: 1986-04-04
Abstract
No abstract record available.
Inventors
- 👤 William P Fairchild
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:45
CPC Classifications
B; B41; B41C; B41C1/00; B41C1/10; B41C1/1091; B41N; B41N3/00; B41N3/03; B41N3/036
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A PROCESS FOR FORMING A DIRECT IMAGE PAPER OFFSET MASTER, SAID PROCESS COMPRISING COATING A HIGH WET STRENGTH PAPER WITH AN AQUEOUS COATING COMPOSITIO CONTAINING AN INERT PIGMENT AND A WATER SOLUBLE SALT OF A COLLOIDAL CELLULOSE SULFATE HAVING A D.S. OF 1 TO 3 AND HAVING A VISCOSITY AT A 1% CONCENTRATION IN AN AQUEOUS MEDIA IN EXCESS OF 20 CPS. AS MEASURED BY A BROOKFIELD SYNCHRO ELECTRIC VISCOMETER, MODEL LVF, AT 60 R.P.M. AND A TEMPERATURE OF 25*C., SAID SALT BEING CHARACTERIZED AS ONE WHICH IN AQUEOUS SOLUTION GIVES A PH FROM IN EXCESS OF 6 TO ABOUT 7, DRYING SAID COATED SHEET AND TREATING THE SHEET WITH AN AQUEOUS SOLUTION OF A SOLUBLE POTASSIUM SALT IN A SUFFICIENT AMOUNT TO INSOLUBILIZE THE SAID CELLULOSE SULFATE SALT SUCH THAT IT IS WATER RESISTANT.
Claim 2
Dependent Claim
135 words
A PROCESS FOR FORMING A DIRECT IMAGE PAPER OFFSET MASTER, SAID PROCESS COMPRISING COATING A HIGH WET STRENGTH PAPER WITH AN AQUEOUS COATING COMPOSITIO CONTAINING AN INERT PIGMENT AND A WATER SOLUBLE SALT OF A COLLOIDAL CELLULOSE SULFATE HAVING A D.S. OF 1 TO 3 AND HAVING A VISCOSITY AT A 1% CONCENTRATION IN AN AQUEOUS MEDIA IN EXCESS OF 20 CPS. AS MEASURED BY A BROOKFIELD SYNCHRO ELECTRIC VISCOMETER, MODEL LVF, AT 60 R.P.M. AND A TEMPERATURE OF 25*C., SAID SALT BEING CHARACTERIZED AS ONE WHICH IN AQUEOUS SOLUTION GIVES A PH FROM IN EXCESS OF 6 TO ABOUT 7, DRYING SAID COATED SHEET AND TREATING THE SHEET WITH AN AQUEOUS SOLUTION OF A SOLUBLE POTASSIUM SALT IN A SUFFICIENT AMOUNT TO INSOLUBILIZE THE SAID CELLULOSE SULFATE SALT SUCH THAT IT IS WATER RESISTANT.
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) | 1971-02-12 | 1971-08-14 | 1972-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-12 | 1975-08-14 | 1976-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-12 | 1979-08-14 | 1980-02-13 | $7700.00 | Window Closed / Lapsed |