US4020261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copy sheet for use in pressure sensitive manifold sheet
Assignee: Kanzaki Paper Manufacturing Co Ltd
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Filing: 1975-03-21
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Granted: 1977-04-26
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Expires: 1995-03-21
Abstract
Abstract In a copy sheet for use in a pressure sensitive manifold sheet comprising support having coated thereon a layer of electron accepting reactant material, an improvement which is characterized in that said electron accepting reactant material is a calcined activated clay which is pulverized in water to particle size reduced by at least 10% based on the mean particle size thereof before the pulverization and has a mean particle size of 1 to 10 mu .
Inventors
- 👤 Shinichi Oda
- 👤 Akira Nakanishi
- 👤 Takio Kuroda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:30
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; B41M5/1555; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
84 words
In a copy sheet for use in pressure senstive manifold sheets of a transfer-copy system comprising a support having coated thereon a layer of electron accepting reactant material including a binder, an improvement which is characterized in that said electron accepting reactant material is a calcined activated clay which is pulverized in water to a particle size at least 10% smaller, based on the mean particle size thereof, than before the pulverization and has a resulting mean particle size of 1 to 10 μ.
Claim 2
Dependent Claim
84 words
In a copy sheet for use in pressure senstive manifold sheets of a transfer-copy system comprising a support having coated thereon a layer of electron accepting reactant material including a binder, an improvement which is characterized in that said electron accepting reactant material is a calcined activated clay which is pulverized in water to a particle size at least 10% smaller, based on the mean particle size thereof, than before the pulverization and has a resulting mean particle size of 1 to 10 μ.
Claim 3
Dependent Claim
23 words
The copy sheet according to claim 1, in which said particle size is at least 15% smaller based on the mean particle size.
Claim 4
Dependent Claim
23 words
The copy sheet according to claim 1, in which said mean particle size of the calcined activated clay is 2 to 8 μ.
Claim 5
Dependent Claim
20 words
The copy sheet according to claim 1, in which said layer further contains microcapsules containing electron donating colourless chromogenic material.
Claim 6
Dependent Claim
27 words
Pressure sensitive manifold sheets of a transfer-copy system having the copy sheet claimed in claim 1 and a transfer sheet comprising a color-forming coating on a support.
Claim 7
Dependent Claim
65 words
Pressure sensitive manifold sheets of a transfer-copy system having the copy sheet claimed in claim 1, a transfer sheet comprising a color-forming coating on a support and at least one middle sheet, said middle sheet being positioned between the copy sheet and transfer sheet and the middle sheet having one surface coated with a color-forming coating and the other surface coated with an acceptor coating.
Claim 8
Dependent Claim
15 words
Pressure sensitive manifold sheets of transfer-copy system having the copy sheet claimed in claim 4.
Claim 9
Dependent Claim
87 words
A method for preparing a copy sheet claimed in claim 1 comprising a step of forming a coating layer on a support from a coating composition, said coating composition comprising water, a calcined activated clay as an electron accepting reactant material and binder dispersed or dissolved therein, wherein said calcined activated clay is pulverized in water to a particle size at least 10% smaller, based on the mean particle size thereof, than before the pulverization and having a resulting mean particle size of 1 to 10 μ.
Claim 10
Dependent Claim
20 words
The method for preparing a copy sheet according to claim 8, in which said pulverization is conducted by sand grinder.
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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |