Patent FR2144667B1 successfully refreshed from Google Patents.
Patent US3653945A successfully refreshed from Google Patents.
US3653945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of reactant sheets for developing colorless dye images
Assignee: Mead Corp
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Filing: 1970-10-29
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Granted: 1972-04-04
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Expires: 1990-10-29
Abstract
Abstract Bond-like reactant sheets for use developing colored images on the surfaces thereof formed from colorless dyes are produced by applying to a paper substrate a volatile organic solvent solution of phenol-formaldehyde polymer and quickly evaporating the solvent before substantial penetration of the paper substrate, whereby a uniform discontinuous film of said polymer is formed on the exposed surface of the top layer of fibers or pigments particles of said substrate, said dried polymer film being applied at the rate of 0.01 to 0.2 pound per 1,300 square feet of surface. A preferred method of applying said solvent solution of phenol-formaldehyde polymer is by modified offset gravure printing means.
Inventors
- 👤 Gerald T Davis
- 👤 Robert A Fetters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:31
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; A; A01; A01K; A01K63/00; A01K63/003; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/27; Y10T428/273; Y10T428/277; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31964; Y10T428/31967; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
30 words
A method according to claim 1, wherein the wet film of coating applied to said paper substrate has a thickness of not substantially greater than 2 X 10 4 inches.
Claim 2
Dependent Claim
37 words
A method according to claim 1, wherein said polymer is a substituted phenol-formaldehyde novolak condensation product in which at least one group ortho to the phenolic OH group is a hydrogen, hydroxyl, halogen, methyl or methylene group.
Claim 3
Dependent Claim
52 words
A method according to claim 1, wherein said polymer is selected from novolak condensation polymers of paraalkylphenol formaldehyde where the alkyl radical contains four to eight carbon atoms, parachlorophenol-formaldehyde, orthochlorophenol-formaldehyde, paraphenyl-formaldehyde, and the mixed novolak condensation polymers of parachloroparalkylphenols in 1:1 to 3:1 mol ratio with formaldehyde, and mixtures of said polymers.
Claim 4
Dependent Claim
75 words
A method according to claim 1, wherein said volatile organic solvent solution of said phenol-formaldehyde polymer is applied to said paper substrate by a modified offset gravure printing means whereby said solution is metered onto an etched or engraved gravure roll from which it is then transferred by rolling pressure contact to a roll of softer composition from which the film of solution is transferred to the paper base substrate by rolling pressure contact therewith.
Claim 5
Dependent Claim
39 words
The method according to claim 1, characterized in that the solvent for said phenolic polymer is selected from the group of fast drying solvents consisting of toluene, xylene, isopropyl alcohol, ethyl alcohol, acetone, methyl ethyl ketone and butyl acetate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |