Patent US4824486A successfully refreshed from Google Patents.
US4824486A
Expired / Lapsed
US
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Simulated watermark printing system
Assignee: WESTVACO Corp 299 PARK AVENUE NEW YORK NEW YORK 10171 A CORP OF
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Filing: 1987-08-31
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Granted: 1989-04-25
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Expires: 2007-08-31
Abstract
Abstract A wet laid watermark of uncoated paper is simulated by the use of a resin or resin-plasticizer mixture dissolved in a slow evaporating, high boiling solvent. A sufficient quantity of the low viscosity solution is printed onto an uncoated paper sheet of stationary grade by a standard flexographic press to penetrate the paper fiber and deposit a non-tacky solid having a refractive index which closely approximates that of cellulose. The resulting image of the print is visible to both faces of the paper sheet.
Inventors
- 👤 Robert E. Lafler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:24
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/02; C09D11/08; B; B41; B41M; B41M3/00; B41M3/10; Y; Y10; Y10S; Y10S260/00; Y10S260/38
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
79 words
A printing solution for reducing the opacity index of paper to approximately that of cellulose comprising a solution of about 50% solids having a refractive index of between 1.50 and 1.54 and approximately 50% solvent having a boiling point in excess of 290° F., said solids portion of said solution comprising about 70% to 90% soluble, oxidation resistant resin that is the hydrogenated ester of rosin having a refractive index of about 1.50 and about 10% to 30% plasticizer.
Claim 2
Dependent Claim
79 words
A printing solution for reducing the opacity index of paper to approximately that of cellulose comprising a solution of about 50% solids having a refractive index of between 1.50 and 1.54 and approximately 50% solvent having a boiling point in excess of 290° F., said solids portion of said solution comprising about 70% to 90% soluble, oxidation resistant resin that is the hydrogenated ester of rosin having a refractive index of about 1.50 and about 10% to 30% plasticizer.
Claim 3
Dependent Claim
15 words
A printing solution as described by claim 1 wherein said plasticizer is a polyester compound.
Claim 4
Dependent Claim
18 words
A printing solution as described by claim 1 wherein said plasticizer is a high molecular weight, hydroabietyl alcohol.
Claim 5
Dependent Claim
15 words
A printing solution as described by claim 1 wherein said plasticizer is butyl benzyl phthalate.
Claim 6
Dependent Claim
25 words
A printing solution as described by claim 1 wherein said plasticizer is a hydrogenated methyl ester of rosin having a refractive index of about 1.52.
Claim 7
Independent Claim
75 words
A method of simulating watermarked paper comprising the step of printing a selected watermark indicia upon an uncoated paper sheet with a solution of approximately 50% solids and 50% solvent wherein said solids constituent of said solution has an opacity index approximating that of cellulose and comprises about 70% to 90% soluble, oxidation resistant resin and about 10% to 30% plasticizer and wherein said solvent constituent has a boiling point in excess of 290° F.
Claim 8
Independent Claim
75 words
A method of simulating watermarked paper comprising the step of printing a selected watermark indicia upon an uncoated paper sheet with a solution of approximately 50% solids and 50% solvent wherein said solids constituent of said solution has an opacity index approximating that of cellulose and comprises about 70% to 90% soluble, oxidation resistant resin and about 10% to 30% plasticizer and wherein said solvent constituent has a boiling point in excess of 290° F.
Claim 9
Dependent Claim
20 words
A method of simulating watermarked paper as described by claim 6 wherein said soluble resin is a stabilized ester resin.
References Cited (Backward Citations)
US3978274A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |