Patent US3640756A successfully refreshed from Google Patents.
US3640756A
Expired / Lapsed
US
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Remoistenable pregummed products
Assignee: Scholten Research NV
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Filing: 1968-10-28
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Granted: 1972-02-08
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Expires: 1988-10-28
Abstract
Abstract The object of the invention is a remoistenable product comprising a substrate, e.g. paper or paperboard, an adhesive consisting of a high molecular weight polymeric binding agent and a remoistenable amylaceous adhesive said product being characterized in that the amylaceous adhesive is a dry, cold water swelling, cross-linked, granular starch ester or starch ether containing hydrophilic substituents, the granules of said starch product being in discrete, nonagglomerated form.
Inventors
- 👤 Pieter Johannes Adrian Beersma
- 👤 Albert Hendrik Veening
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:36
CPC Classifications
C; C09; C09J; C09J103/00; C09J103/04; C09J7/00; C09J7/20; C09J7/21; C09J7/30; C09J7/32; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/283; Y10T428/2852; Y10T428/2865
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
31 words
The product of claim 1 in which the degree of substitution of the hydrophilic groups in the chemically cross-linked granular starch ether or ester containing hydrophilic substituents is at least 0.1.
Claim 2
Dependent Claim
34 words
The product of claim 1 in which the chemically cross-linked granular starch ester containing hydrophilic substituents is a cross-linked granular starch phosphate ester obtained by reacting granular starch, a phosphorus containing acid and urea.
Claim 3
Dependent Claim
26 words
The product of claim 1 in which the chemically cross-linked granular starch ether containing hydrophilic substituents is a granular carboxymethyl ether of starch, cross-linked with epichlorohydrin.
Claim 4
Dependent Claim
57 words
The product of claim 1 in which the chemically cross-linked granular starch ether or ester containing hydrophilic substituents consists of granules which present between crossed nicols a polarization cross, and which swell upon moistening with water of room temperature to such an extent that substantially all granules loose their polarization cross, but do not disintegrate and dissolve.
Claim 5
Dependent Claim
11 words
The product of claim 1 in which the substrate is paper.
Claim 6
Dependent Claim
12 words
The product of claim 1 in which the substrate is wall paper.
Claim 7
Dependent Claim
41 words
The product of claim 1 wherein the chemically cross-linked starch ether or starch ester is cross-linked with a member selected from the group consisting of phosphorus oxychloride, water-soluble trimetaphosphate salts, diepoxides, epihalohydrins, aldehydes, dialdehydes, dimethylolurea, dimethylol-ethylene urea, a methylolmelamine and 1,3,5-trichlorotriazine.
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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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |