Patent US3622366A successfully refreshed from Google Patents.
US3622366A
Expired / Lapsed
US
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Encapsulation method
Assignee: PPG Industries Inc
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Filing: 1969-08-06
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Granted: 1971-11-23
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Expires: 1989-08-06
Abstract
Abstract Encapsulation is effected by freezing an aqueous composition of the material to be encapsulated and thereafter contacting frozen particles with a hydratable salt. The frozen particles are sized prior to contact with the hydratable salt. Water provided from the frozen particles and hydratable salt are reacted to form the encapsulating coating of hydrated salt.
Inventors
- 👤 Loyd W Piester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:59
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/006; C; C11; C11D; C11D3/00; C11D3/39; C11D3/3902; C11D3/3905; C11D3/3935
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
22 words
The method of claim 1 wherein droplets of thE composition containing liquid water and normally solid component are formed and thereafter frozen.
Claim 2
Dependent Claim
19 words
The method of claim 2 wherein the frozen droplets are sized prior to contact with the water reactive material.
Claim 3
Dependent Claim
19 words
The method of claim 3 wherein the droplets outside the desired size range are liquified and recycled for refreezing.
Claim 4
Dependent Claim
27 words
The method of claim 1 wherein the solidified composition is subdivided, and the subdivided solid particles are sized prior to contact with the material reactive with water.
Claim 5
Dependent Claim
18 words
The method of claim 5 wherein solid particles outside the desired size are liquified and recycled for refreezing.
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein the water reactive material is hydratable salt.
Claim 7
Dependent Claim
67 words
An encapsulation method for providing a dry solid composition of small particles which comprises freezing a composition of liquid water and a water insoluble normally solid peracid, contacting particles of the frozen composition with finely divided solid hydratable salt and effecting hydration of the hydratable salt with water from the frozen particles whereby the encapsulate a solid core of the peracid in a coating of hydrated salt.
Claim 8
Dependent Claim
24 words
The method of claim 8 wherein the peracid is diperisophthalic acid and the hydratable salt and the coating of hydrated salt are water soluble.
Claim 9
Dependent Claim
43 words
The method of claim 8 wherein small droplets of the composition of liquid water and water insoluble normally solid peracid are frozen and thereafter contacted with the hydratable salt at a temperature at which a higher hydrate of the hydratable salt is stable.
Claim 10
Dependent Claim
42 words
The method of claim 8 wherein the composition of liquid water and water insoluble normally solid peracid is frozen, the so frozen composition subdivided, the subdivided solid particles sized, and the particles of preselected size so obtained are contacted with hydratable salt.
Claim 11
Dependent Claim
17 words
The method of claim 11 wherein the particles other than the preselected size are melted and refrozen.
Claim 12
Dependent Claim
30 words
The method of claim 8 wherein the particles are sized prior to contact with hydratable salt with only those particles within the preselected size being then contacted with hydratable salt.
Claim 13
Dependent Claim
18 words
The method of claim 13 wherein the particles outside the preselected size are melted and recycled for freezing.
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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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |