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US4046404A
Expired / Lapsed
US
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Carbonless paper for use in electrostatographic copiers
Assignee: Xerox Corp
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Filing: 1976-11-26
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Granted: 1977-09-06
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Expires: 1996-11-26
Abstract
Abstract Disclosed is a carbonless paper suitable for use in electrostatographic copiers. The paper comprises a base sheet of paper making fibers having uniformly dispersed therein from about 0.05 to 10 weight percent of hollow, generally spherical particles ranging in diameter from about 1/2 to 200 microns in diameter. These particles serve the purpose of increasing the stiffness and caliper of the paper sheet. The carbonless paper also contains a color forming material encapsulated in discrete particles and/or a color developing material.
Inventors
- 👤 George Treier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:41
CPC Classifications
G; G03; G03G; G03G7/00; B; B41; B41M; B41M5/00; B41M5/124; B41M5/1243; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/25; Y10T428/254
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
62 words
A carbonless paper sheet suitable for imaging in electrostatographic copiers which comprises a base sheet of paper making fibers having uniformly distributed therein from about 0.05 to 10 weight percent of hollow, generally spherical particles ranging in diameter from 1/2 to about 200 microns, said carbonless paper also containing a color forming material encapsulated in discrete capsules and/or a color developing material.
Claim 2
Dependent Claim
62 words
A carbonless paper sheet suitable for imaging in electrostatographic copiers which comprises a base sheet of paper making fibers having uniformly distributed therein from about 0.05 to 10 weight percent of hollow, generally spherical particles ranging in diameter from 1/2 to about 200 microns, said carbonless paper also containing a color forming material encapsulated in discrete capsules and/or a color developing material.
Claim 3
Dependent Claim
21 words
The paper sheet of claim 1 wherein the hollow, generally spherical particles are from about 3 to 50 microns in diameter.
Claim 4
Dependent Claim
17 words
The sheet of claim 2 wherein the particles are from about 5 to 20 microns in diameter.
Claim 5
Dependent Claim
20 words
The paper sheet of claim 1 wherein the hollow, generally spherical particles are comprised of a vinyl chloride/vinylidene chloride copolymer.
Claim 6
Dependent Claim
19 words
The paper sheet of claim 1 wherein the concentration of particles is from about 0.5 to 5 weight percent.
Claim 7
Dependent Claim
31 words
The paper sheet of claim 1 wherein a color forming material encapsulated in discrete capsules is coated on one side thereof along with a binder to hold the capsules in place.
Claim 8
Dependent Claim
21 words
The paper sheet of claim 6 wherein the binder is starch, a starch derivative, polyvinyl alcohol, polystyrene or a mixture thereof.
Claim 9
Dependent Claim
20 words
The paper sheet of claim 6 wherein a cushioning material is combined with the binder and color former containing capsules.
Claim 10
Dependent Claim
21 words
The paper sheet of claim 6 wherein the walls of the capsules are comprised of gelatin, a urea-formaldehyde resin or nylon.
Claim 11
Dependent Claim
20 words
The paper sheet of claim 6 wherein the color forming material is crystal violet lactone or benzoyl leuco methylene blue.
Claim 12
Dependent Claim
16 words
The paper sheet of claim 1 wherein one side is coated with a color developing material.
Claim 13
Dependent Claim
22 words
The paper sheet of claim 11 wherein the color developing material is extended with a coating clay and combined with a binder.
Claim 14
Dependent Claim
17 words
The paper sheet of claim 12 wherein the coating clay is Kaolin and the binder is starch.
Claim 15
Dependent Claim
19 words
The paper sheet of claim 13 wherein the color developing material is a phenolic resin or an acid clay.
Claim 16
Dependent Claim
40 words
The paper sheet of claim 1 wherein one side is coated with a color developing material and the other side is coated with a binder having dispersed therein a cushioning material and a color forming material encapsulated in discrete capsules.
Claim 17
Dependent Claim
31 words
The paper sheet of claim 1 wherein the color developing material and encapsulated color developing material are coated on the same side of the sheet to form a self-contained carbonless paper.
Claim 18
Dependent Claim
29 words
The paper sheet of claim 1 wherein the color developing material and encapsulated color forming material are dispersed among the paper making fibers to form a self-contained carbonless paper.
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) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |