US4234437A
Expired / Lapsed
US
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Suspension of solid particles in a liquid
Assignee: Arbman Development AB
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Filing: 1974-12-23
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Granted: 1980-11-18
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Expires: 1994-12-23
Abstract
Abstract A suspension of solid particles in an organic or aqueous liquid comprises a lyotropic liquid crystal as suspension stabilizer.
Inventors
- 👤 Stig E. Friberg
- 👤 Kelvin Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:08
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0004; B01J13/0034; C; C09; C09K; C09K23/00; H; H01; H01F; H01F1/00; H01F1/44
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
28 words
In a suspension of solid particles in an organic or aqueous liquid and a stabilizing agent, the improvement which comprises said stabilizing agent being a lyotropic liquid crystal.
Claim 2
Dependent Claim
28 words
In a suspension of solid particles in an organic or aqueous liquid and a stabilizing agent, the improvement which comprises said stabilizing agent being a lyotropic liquid crystal.
Claim 3
Dependent Claim
24 words
A suspension as claimed in claim 1, wherein said lyotropic liquid crystal contains at least one amphiphilic substance which is a surface active agent.
Claim 4
Dependent Claim
24 words
A suspension as claimed in claim 2 wherein said lyotropic liquid crystal contains a second amphiphilic substance which is not a surface active agent.
Claim 5
Dependent Claim
22 words
A suspension as claimed in claim 6 wherein said solid particles are magnetic particles having a size of less than 1 micron.
Claim 6
Dependent Claim
25 words
A suspension as claimed in claim 4 wherein the system contains magnetic partices in a quantity of 300 to 450 grams per liter of suspension.
Claim 7
Dependent Claim
51 words
In a suspension of solid particles in an organic or aqueous liquid and a stablizing agent, the improvement which comprises said liquid being a lyotropic liquid crystal phase consisting essentially of a surface active agent and an amphiphilic substance having a hydrocarbon chain of at least five carbon atoms and water.
Claim 8
Dependent Claim
51 words
In a suspension of solid particles in an organic or aqueous liquid and a stablizing agent, the improvement which comprises said liquid being a lyotropic liquid crystal phase consisting essentially of a surface active agent and an amphiphilic substance having a hydrocarbon chain of at least five carbon atoms and water.
Claim 9
Dependent Claim
22 words
A suspension as claimed in claim 6 wherein the liquid is an aqueous liquid containing more than 50% by weight of water.
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) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |