Patent US3900690A successfully refreshed from Google Patents.
US3900690A
Expired / Lapsed
US
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Process for the production of dimensionally stable, planar materials coated on one side
Assignee: Glasurit Werke M Winkelmann GmbH
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Filing: 1974-05-13
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Granted: 1975-08-19
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Expires: 1994-05-13
Abstract
Abstract A method of producing dimensionally stable, coated cellulose containing base materials wherein one side of the material is coated in a conventional manner with the customary inorganic or organic coating agents, such as sodium silicate or synthetic resins optionally containing coloring agents, pigments and/or hard powdered materials, such as emery, quartz sand, pulverized glass, silicon carbide, pumice, aluminum oxides, kieselguhr or films, and the other side of the material is impregnated with a solution of a silicone fluid in one or more organic solvents and the solvents are optionally evaporated.
Inventors
- 👤 Gunther Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:08
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/59; B; B32; B32B; B32B27/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31971; Y10T428/31989; Y10T428/31993
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A METHOD FOR PRODUCING A DIMENSIONALLY STABLE POROUS CELULOSIC SUBSTRATE BY IMPREDGNATING THE UNCOATED SIDE OPPOSITE TO THAT BEARING A MOISTUREPROOF IMPEREABLE SURFACE COATING WITH SILICONE FLUIDS, AND DRYING SAID COATING, THE IMPROVEMENT COMPRISING APPLYING TO SAID UNCOATED SIDE OF SAID SUBSTRAYE A SOLUTION CONTAINING 90 - 97 PERCENT BY WEIGHT OF A SOLVENTS SELECTED FROM THE GROUP CONSISTING OF ORGANIC HYDROPHILLIC SOLVENTS OR SOLVENTS CONTAINING NOT LESS THAN 10 PERCENT OF SAID HYDROPHILIC SOLVENTS AND 3 - 10 PERCENT BY WEIGHT SILICONE FLUID HAVING A VISCOSITY OF 0.65 - 1,000,000 CENTISTOKES AND A MOLECULAR WEIGHT BETWEEN ABOUT 600 - 400,000.
Claim 2
Independent Claim
101 words
A METHOD FOR PRODUCING A DIMENSIONALLY STABLE POROUS CELULOSIC SUBSTRATE BY IMPREDGNATING THE UNCOATED SIDE OPPOSITE TO THAT BEARING A MOISTUREPROOF IMPEREABLE SURFACE COATING WITH SILICONE FLUIDS, AND DRYING SAID COATING, THE IMPROVEMENT COMPRISING APPLYING TO SAID UNCOATED SIDE OF SAID SUBSTRAYE A SOLUTION CONTAINING 90 - 97 PERCENT BY WEIGHT OF A SOLVENTS SELECTED FROM THE GROUP CONSISTING OF ORGANIC HYDROPHILLIC SOLVENTS OR SOLVENTS CONTAINING NOT LESS THAN 10 PERCENT OF SAID HYDROPHILIC SOLVENTS AND 3 - 10 PERCENT BY WEIGHT SILICONE FLUID HAVING A VISCOSITY OF 0.65 - 1,000,000 CENTISTOKES AND A MOLECULAR WEIGHT BETWEEN ABOUT 600 - 400,000.
Claim 3
Dependent Claim
22 words
The method of claim 1, wherein said impermeable surface coating is selected from the group consisting of sodium silicate and synthetic resins.
Claim 4
Dependent Claim
14 words
The method of claim 1, wherein said impermeable surface coating is a pressed film.
Claim 5
Dependent Claim
22 words
The method of claim 1, wherein said base sheet material is exposed to moisture prior to the application of said silicone fluid.
Claim 6
Dependent Claim
9 words
The product obtained by the method of claim 1.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |