Patent US3617410A successfully refreshed from Google Patents.
US3617410A
Expired / Lapsed
US
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Pressure-sensitive recording sheet and method of making
Assignee: Mead Corp
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Filing: 1969-05-01
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Granted: 1971-11-02
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Expires: 1989-05-01
Abstract
Abstract Record sheets having improved resistance to smudging and calender intensity for use with transfer sheets containing microscopic rupturable capsules of a colorless marking fluid are produced by coating a base sheet with a composition comprising a finely powdered oil-soluble acid-reactant polymeric material, a substantially nonreactant pigment having a relative sediment volume (RSV) in excess of 2 and a binder for said polymeric material and pigment.
Inventors
- 👤 Kenneth H Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:44
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
19 words
A record sheet according to claim 1 in which the polymeric powder is an oil-soluble acid-reactant phenolic polymer powder.
Claim 2
Dependent Claim
30 words
A record sheet according to claim 1 in which the nonreactant pigment is selected from the group consisting of hydrated alumina, high-bulking filler clay and talc pigments and mixtures thereof.
Claim 3
Dependent Claim
19 words
A record sheet according to claim 3 in which the nonreactant pigment additionally contains a nonreactant kaolin coating clay.
Claim 4
Dependent Claim
15 words
A record sheet according to claim 1 in which the nonreactant pigment is hydrated alumina.
Claim 5
Dependent Claim
19 words
A record sheet according to claim 5 in which the nonreactant pigment additionally contains a nonreactant kaolin coating clay.
Claim 6
Dependent Claim
14 words
A record sheet according to claim 1 in which the nonreactant pigment is talc.
Claim 7
Dependent Claim
17 words
A record sheet acCording to claim 1 in which the nonreactant pigment is a high-bulking filler clay.
Claim 8
Dependent Claim
20 words
A record sheet according to claim 1 in which the coating contains approximately 3 percent by weight of colloidal silica.
Claim 9
Dependent Claim
14 words
A record sheet according to claim 1 in which the base sheet is paper.
Claim 10
Independent Claim
124 words
A method of producing a record sheet for use in producing a colored mark by pressure contact with a surface comprising pressure rupturable capsules containing a colorless marking oil, comprising the steps of applying to a base sheet an aqueous coating composition consisting essentially of 5 to 15 percent by weight of solids of a finely powdered oil-soluble acid-reactant polymeric powder capable of producing a color when contacted by said colorless marking oil, a nonreactant pigment having an RSV value in excess of 2, said nonreactant pigment producing substantially no color in contact with said colorless marking oil, and sufficient binder for said oil-soluble acid-reactant polymeric powder and said pigment to produce a coated sheet satisfactory for printing, and drying said applied coating composition.
References Cited (Backward Citations)
US2983756A
Cited
US3455721A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |