US3936573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microcapsule having hydrophilic wall material and containing water soluble core material
Assignee: WTA Inc
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Filing: 1974-08-23
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Granted: 1976-02-03
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Expires: 1994-08-23
Abstract
Abstract A pressure-rupturable, liquid-droplet-containing microcapsule having walls of hydrophilic polymeric film-material such as gelatin wherein the liquid core-material is a water-immiscible oil having water dissolved therein together with additional material which is water-soluble such as a water-soluble colorless chromogenic dye-precursor material or color-developing reactant material.
Inventors
- 👤 Bruce W. Brockett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:03
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/20; B01J13/203; B41; B41M; B41M5/00; B41M5/124; B41M5/165; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
61 words
A pressure-rupturable liquid-droplet-containing microcapsule comprising hydrophilic, water-swellable, organic, polymericfilm wall material and core material comprising a water-immiscible oil which is capable of dissolving about one to ten percent by weight of water, said oil being further characterized by having dissolved therein water and a water-soluble color-forming reactant material all mutually dissolved to yield a core material of a single phase solution.
Claim 2
Dependent Claim
61 words
A pressure-rupturable liquid-droplet-containing microcapsule comprising hydrophilic, water-swellable, organic, polymericfilm wall material and core material comprising a water-immiscible oil which is capable of dissolving about one to ten percent by weight of water, said oil being further characterized by having dissolved therein water and a water-soluble color-forming reactant material all mutually dissolved to yield a core material of a single phase solution.
Claim 3
Dependent Claim
13 words
The microcapsule of claim 1 wherein the oil is an organic phosphate ester.
Claim 4
Dependent Claim
13 words
The microcapsule of claim 1 wherein the color-forming reactant material is zinc chloride.
Claim 5
Dependent Claim
19 words
The microcapsule of claim 1 wherein the core-material oil is saturated with water and the water-soluble color-forming reactant material.
Claim 6
Dependent Claim
14 words
The microcapsule of claim 1 wherein the wall material is hardened hydrophilic film material.
Claim 7
Dependent Claim
21 words
The microcapsule of claim 5 wherein the hydrophilic film material is hardened by addition thereto of hydrophobic organic polymeric film material.
Claim 8
Dependent Claim
33 words
The microcapsule of claim 5 wherein the wall material includes gelatin, the oil is selected from the group consisting of tricresyl phosphate and tributyl phosphate, and the color-forming reactant material is zinc chloride.
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) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |