US3954666A
Expired / Lapsed
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Semipermeable microcapsules containing heterogeneous catalysts and ferromagnetic materials
Assignee: EIDP Inc
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Filing: 1974-07-11
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Granted: 1976-05-04
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Expires: 1994-07-11
Abstract
Abstract Described are semipermeable microcapsules which comprise an outer semipermeable polymeric skin encapsulating a finely divided heterogeneous catalyst and a ferromagnetic material. The microcapsules are useful as magnetic, heterogeneous catalysts.
Inventors
- 👤 Mark James Marquisee
- 👤 William W. Prichard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:22
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/16; B01J13/025; B01J33/00; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06; H01F1/061; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
64 words
A semipermeable microcapsule which comprises an outer semipermeable polymeric skin encapsulating (1) a finely divided solid heterogeneous catalyst selected from the group consisting of nickel, palladium, platinum, ruthenium, rhodium, platinum oxide, cobalt oxide and ion exchange resins and (2) a ferromagnetic material dispersed in a medium selected from the group consisting of water and organic solvents, said polymeric skin being permeable to said medium.
Claim 2
Dependent Claim
64 words
A semipermeable microcapsule which comprises an outer semipermeable polymeric skin encapsulating (1) a finely divided solid heterogeneous catalyst selected from the group consisting of nickel, palladium, platinum, ruthenium, rhodium, platinum oxide, cobalt oxide and ion exchange resins and (2) a ferromagnetic material dispersed in a medium selected from the group consisting of water and organic solvents, said polymeric skin being permeable to said medium.
Claim 3
Dependent Claim
19 words
The semipermeable microcapsule of claim 1 in which the polymeric skin is a condensation polymer formed by interfacial polycondensation.
Claim 4
Dependent Claim
14 words
The semipermeable microcapsule of claim 2 in which the condensation polymer is a polyamide.
Claim 5
Dependent Claim
15 words
The semipermeable microcapsule of claim 3 in which the heterogeneous catalyst is a hydrogenation catalyst.
Claim 6
Dependent Claim
23 words
The semipermeable microcapsule of claim 3 in which the ferromagnetic material is powdered iron having a particle size of less than 1 micron.
Claim 7
Dependent Claim
15 words
The semipermeable microcapsule of claim 5 in which the heterogeneous catalyst is a hydrogenation catalyst.
Claim 8
Dependent Claim
14 words
The semipermeable microcapsule of claim 6 in which the hydrogenation catalyst is platinum oxide.
Claim 9
Dependent Claim
18 words
The semipermeable microcapsule of claim 2 in which the outer skin is filled with water containing an osmoticum.
Claim 10
Dependent Claim
16 words
The semipermeable microcapsule of claim 2 in which the outer skin is filled with organic solvent.
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) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |