Patent US3852094A successfully refreshed from Google Patents.
US3852094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for desensitizing carbonless papers
Assignee: 3M Co
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Filing: 1973-11-23
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Granted: 1974-12-03
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Expires: 1993-11-23
Abstract
Abstract The disclosed desensitizing agents, when combined with a suitable solvent, can be used to desensitize ''''carbonless papers of the DTO/metal type wherein the DTO compound is encapsulated and is released for chemical interaction with a coreactant metal salt by rupture of the capsules. The preferred desensitizing agents are partial esters of ethylene diaminetetraacetic acid, which partial esters are soluble in suitable organic media and form stable, substantially colorless complexes with, for example, nickel salts. Various homologs and analogs of these partial ester derivatives are also operative in the invention, as are certain less preferred compounds, i.e., certain diamines, oximes, and vic.-dimercaptans. The preferred desensitizing agents are also useful for desensitizing ''''carbonless'''' papers of the leuco dye/acidic clay type.
Inventors
- 👤 D Yarian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:05
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/128
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
97 words
A PRINTED FORM COMPRISING A PAPERLIKE SHEEET, A MATERIAL PRESENT ON AT LEAST PART OF A SURFACE OF SAID PAPERLIKE SHEET, SAID MATERIAL BEING COLOR-REACTIVE WITH A DYE PRECURSOR, AND INTERACTED WITH AT LEAST A PORTION OF SAID MATERIAL, A COMPLEXING AGENT SOLUBLE IN ORGANIC MEDIA AND CAPABLE OF FORMING A COORDINATION COMPOUND WITH A SALT OR NICKEL, COPPER, COBALT, OR CADMIUM, WHEREIN SAID COMPLEXING AGENT IS CAPABLE OF FORMING A COMPLEX IN SAID ORGANIC MEDIA WITH COREACTANNT SALTS SUCH THAT SAID COMPLEX IS MORE STABLE THAN COMPLEXES OF DITHIOOXAMIDE OR DERIVATIVES THEREOF WITH SAID METAL SALTS.
Claim 2
Dependent Claim
97 words
A PRINTED FORM COMPRISING A PAPERLIKE SHEEET, A MATERIAL PRESENT ON AT LEAST PART OF A SURFACE OF SAID PAPERLIKE SHEET, SAID MATERIAL BEING COLOR-REACTIVE WITH A DYE PRECURSOR, AND INTERACTED WITH AT LEAST A PORTION OF SAID MATERIAL, A COMPLEXING AGENT SOLUBLE IN ORGANIC MEDIA AND CAPABLE OF FORMING A COORDINATION COMPOUND WITH A SALT OR NICKEL, COPPER, COBALT, OR CADMIUM, WHEREIN SAID COMPLEXING AGENT IS CAPABLE OF FORMING A COMPLEX IN SAID ORGANIC MEDIA WITH COREACTANNT SALTS SUCH THAT SAID COMPLEX IS MORE STABLE THAN COMPLEXES OF DITHIOOXAMIDE OR DERIVATIVES THEREOF WITH SAID METAL SALTS.
Claim 3
Dependent Claim
15 words
A printed form according to claim 1 wherein said material is a nickel rosinate coating.
Claim 4
Dependent Claim
25 words
A printed form according to claim 1 wherein said material is an electron acceptor capable of forming a color upon reacting with a leuco dye.
Claim 5
Independent Claim
112 words
A method of desensitizing a self-marking, self-contained carbonless paper containing an encapsulated dye precursor comprising dithiooxamide or a derivative thereof and a metal salt coreactive with said dye precursor, said method comprising the step of applying to a surface of said self-marking, self-contained carbonless paper a composition comprising (1) a complexing agent soluble in organic media and capable of forming a complex in said organic media with said coreactant metal salt such that said complex is more stable than complexes of dithiooxamide or derivatives thereof with said metal salt, and (2) an organic liquid having a boiling point less than 125* C. capable of dissolving said metal salt and said complexing agent.
Claim 6
Independent Claim
112 words
A method of desensitizing a self-marking, self-contained carbonless paper containing an encapsulated dye precursor comprising dithiooxamide or a derivative thereof and a metal salt coreactive with said dye precursor, said method comprising the step of applying to a surface of said self-marking, self-contained carbonless paper a composition comprising (1) a complexing agent soluble in organic media and capable of forming a complex in said organic media with said coreactant metal salt such that said complex is more stable than complexes of dithiooxamide or derivatives thereof with said metal salt, and (2) an organic liquid having a boiling point less than 125* C. capable of dissolving said metal salt and said complexing agent.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |