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Patent US4919044A successfully refreshed from Google Patents.
US4919044A
Expired / Lapsed
US
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Simulated watermark printing system
Assignee: Westvaco Corp
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Filing: 1988-12-05
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Granted: 1990-04-24
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Expires: 2008-12-05
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 stationery 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 19:08
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/02; C09D11/08; B; B41; B41M; B41M3/00; B41M3/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
96 words
A method of simulating watermarked paper comprising the steps of printing a selected watermark indicia upon an uncoated paper sheet with a flexographic press having a fountain roll and an anilox roll using a solution of approximately 50% solids having a refractive index of between 1.50 and 1.54 and 50% solvent having a boiling point in excess of 290° F. wherein said solids constituent of said solution comprises 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
Independent Claim
96 words
A method of simulating watermarked paper comprising the steps of printing a selected watermark indicia upon an uncoated paper sheet with a flexographic press having a fountain roll and an anilox roll using a solution of approximately 50% solids having a refractive index of between 1.50 and 1.54 and 50% solvent having a boiling point in excess of 290° F. wherein said solids constituent of said solution comprises 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
37 words
A method of simulating watermarked paper as described by claim 9 wherein said fountain roll has an elastomer surface of about 75 to 85 duromater and said anilox roll has a surface texture of about 180 Pyramid.
Claim 4
Dependent Claim
18 words
A method of simulating watermarked paper as described by claim 1 wherein said plasticizer is a polyester compound.
Claim 5
Dependent Claim
22 words
A method of simulating water marked paper as described by claim 1 wherein said plasticizer is a high molecular weight, hydroabietyl alcohol.
Claim 6
Dependent Claim
18 words
A method of simulating watermarked paper as described by claim 1 wherein said plasticizer is butyl benzyl phthalate.
Claim 7
Dependent Claim
28 words
A method of simulating watermarked paper as described by claim 1 wherein said plasticizer is a hydrogenated methyl ester of rosin having a refractive index of about 1.52.
Claim 8
Dependent Claim
20 words
A method of simulating watermarked paper as described by claim 1 wherein said solvent is propylene glycol methyl ether acetate.
Claim 9
Dependent Claim
19 words
A method of simulating watermarked paper as described by claim 1 wherein said solvent is dipropylene glycol monomethyl ether.
References Cited (Backward Citations)
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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) | 1993-04-23 | 1993-10-23 | 1994-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-23 | 1997-10-23 | 1998-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-23 | 2001-10-23 | 2002-04-24 | $7700.00 | Window Closed / Lapsed |