Patent US5250492A successfully refreshed from Google Patents.
US5250492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coatings for use with business forms, security documents, or safety paper
Assignee: Standard Register Co
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Filing: 1991-03-07
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Granted: 1993-10-05
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Expires: 2011-03-07
Abstract
Abstract Carbonless coating compositions which can be printed onto one or more sheets of a business form or mailer to provide a visible image which is sharper and darker than previous coatings are provided. The compositions also find use on security documents and safety papers to provide a covert image on the document beneath information which may be subject to attempted alteration, such as the amount written on a check. The covert image becomes visible upon the application of pressure or solvent in the area coated to provide evidence of the attempted alteration. The self-contained composition includes an admixture of a color former, a color developer, and a plurality of pressure-rupturable microcapsules containing a solvent. Another solvent-sensitive composition includes an admixture of a color former and a color developer.
Inventors
- 👤 Mark D. Dotson
- 👤 Frank V. Parenti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:42
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M3/00; B41M3/14; B41M3/142
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
102 words
A business form comprising: at least one substrate having a first and second major surface, and having a self-contained coating composition on at least a portion of one of said major surfaces, said self-contained coating composition comprising an admixture of a color former which si stabilized with a complexing agent to prevent premature coloration, a color developer, and a plurality of pressure-rupturable microcapsules containing a solvent, said self-contained coating composition being adapted to release said solvent form said microcapsules upon the impact of the imaging device, to permit reaction of said color former and said color developer to form a visible color.
Claim 2
Dependent Claim
102 words
A business form comprising: at least one substrate having a first and second major surface, and having a self-contained coating composition on at least a portion of one of said major surfaces, said self-contained coating composition comprising an admixture of a color former which si stabilized with a complexing agent to prevent premature coloration, a color developer, and a plurality of pressure-rupturable microcapsules containing a solvent, said self-contained coating composition being adapted to release said solvent form said microcapsules upon the impact of the imaging device, to permit reaction of said color former and said color developer to form a visible color.
Claim 3
Dependent Claim
14 words
The business form of claim 1 wherein said color developer is a phenolic resin.
Claim 4
Dependent Claim
15 words
The business form of claim 2 wherein said phenolic resin contains an alkyl salicyclic acid.
Claim 5
Dependent Claim
11 words
The business form of claim 1 wherein said solvent is diisopropylnaphthalene.
Claim 6
Dependent Claim
14 words
The business form of claim 1 wherein said color former is a leuco dye.
Claim 7
Dependent Claim
13 words
The business form of claim 1 wherein said color former is 3-cyclohexyl-methyl-amino-6-methyl-7-anilino fluoran.
Claim 8
Dependent Claim
13 words
The business form of claim 1 wherein said complexing agent is polyvinyl pyrrolidone.
Claim 9
Dependent Claim
16 words
The business form of claim 1 wherein said self-contained coating composition includes a film forming composition.
Claim 10
Dependent Claim
25 words
The business form of claim 8 wherein said film forming composition is selected from the group consisting of polyvinyl pyrrolidone, polyvinyl alcohol, and mixtures thereof.
Claim 11
Dependent Claim
15 words
The business form of claim 1 wherein said self-contained coating composition includes a non-volatile diluent.
Claim 12
Dependent Claim
13 words
The business form of claim 10 wherein said non-volatile diluent is methyl glucoside.
Claim 13
Dependent Claim
28 words
The business form of claim 1 further comprising a plurality of sheets in a stacked relationship and wherein said self-contained coating composition is coated on the top sheet.
Claim 14
Dependent Claim
63 words
The business form of claim 12 wherein at least one underlying sheet has a second self-contained coating composition on at least a portion of one of said major surfaces, said second self-contained coating composition comprising an admixture of a color former, a color developer, and a plurality of pressure-rupturable microcapsules containing a solvent, said first and said second self-contained coating compositions being non-coextensive.
Claim 15
Independent Claim
113 words
A method for forming visible images on a business form having a first and a second major surface and having a self-contained coating composition on at least a protein of one of said major surfaces, said self-contained coating composition comprising an admixture of a color former which is stabilized with a complexing agent to prevent premature coloration, a color developer, and a plurality of pressure-rupturable microcapsules containing a solvent, which comprises the step of containing said surface of said business form with an imaging device thereby providing a visible image in said self-contained coating composition by rupturing said microcapsules to release said solvent causing reaction of said color former with said color developer.
Claim 16
Independent Claim
113 words
A method for forming visible images on a business form having a first and a second major surface and having a self-contained coating composition on at least a protein of one of said major surfaces, said self-contained coating composition comprising an admixture of a color former which is stabilized with a complexing agent to prevent premature coloration, a color developer, and a plurality of pressure-rupturable microcapsules containing a solvent, which comprises the step of containing said surface of said business form with an imaging device thereby providing a visible image in said self-contained coating composition by rupturing said microcapsules to release said solvent causing reaction of said color former with said color developer.
Claim 17
Dependent Claim
81 words
The method of claim 14 wherein the business form further comprises a plurality of sheets in a stacked relationship wherein said self-contained coating composition is coated on the top sheet and wherein at least one underlying sheet has a second self-contained coating composition on its upper surface, said second self-contained coating composition comprising an admixture of a color former, a color developer, and a plurality of pressure-rupturable microcapsules containing a solvent, said first and said second self-contained coating compositions being non-coextensive.
Claim 18
Dependent Claim
15 words
The method of claim 14 wherein said imaging device directly contacts said self-contained coating composition.
Claim 19
Dependent Claim
36 words
The method of claim 14 further comprising placing a non-reactive shielding means between said imaging device and said self-contained coating composition to reduce the impact of said imaging device on said major surface of said substrate.
Claim 20
Dependent Claim
12 words
The method of claim 14 wherein said complexing agent is polyvinyl pyrrolidone.
Claim 21
Dependent Claim
82 words
A business form comprising at least one substrate having a first and second major surface and having a coating composition on at least a portion of one of said major surfaces, said coating composition comprising an admixture of a color former which is stabilized with a complexing agent to prevent premature coloration, a micro encapsulated solvent and a color developer, said color former and said color developer being adapted to reactively combine to form a visible color upon contact by said solvent.
Claim 22
Dependent Claim
82 words
A business form comprising at least one substrate having a first and second major surface and having a coating composition on at least a portion of one of said major surfaces, said coating composition comprising an admixture of a color former which is stabilized with a complexing agent to prevent premature coloration, a micro encapsulated solvent and a color developer, said color former and said color developer being adapted to reactively combine to form a visible color upon contact by said solvent.
Claim 23
Dependent Claim
13 words
The business form of claim 19 wherein said complexing agent is polyvinyl pyrrolidone.
Claim 24
Dependent Claim
54 words
The business form of claim 19 wherein said solvent is contained in pressure rupturable microcapsules included in said coating composition, said coating composition being adapted to release said solvent from said microcapsules upon impact from an imaging device such that said color former and said color developer reactively combine to form said visible color.
Claim 25
Dependent Claim
17 words
The business form of claim 21 wherein said microcapsules range in size from 3 to 7 microns.
Claim 26
Dependent Claim
84 words
The business form of claim 19 wherein said solvent is contained in pressure rupturable microcapsules contained in a second coating composition on the surface of a second substrate adjacent said first substrate, said second coating composition and said first coating composition facing one another such that solvent from said microcapsules is released upon impact from an imaging device to contact said color former and said color developer, thereby causing said color former and said color developer to reactively combine to form said visible color.
Claim 27
Dependent Claim
14 words
The business form of claim 19 wherein said color former is a leuco dye.
Claim 28
Dependent Claim
14 words
The business form of claim 19 wherein said color developer is a phenolic resin.
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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) | 1996-10-04 | 1997-04-05 | 1997-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-04 | 2001-04-05 | 2001-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-04 | 2005-04-05 | 2005-10-05 | $7700.00 | Window Closed / Lapsed |