US3915855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lipophilic cellulose sponges to remove lipids from the surface of immiscible fluids
Assignee: Anheuser Busch Companies LLC
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Filing: 1974-03-04
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Granted: 1975-10-28
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Expires: 1994-03-04
Abstract
Abstract This disclosure concerns a cellulose fatty acid ester sponge which picks up oil and non-polar solvents. The sponge has a bulk density of 0.02g/cm3 to 0.06g/cm3 and the degree of substitution of the cellulose is 1.5 to 2.9. The sponge is made by reacting a cellulose sponge with fatty acid derivatives, specifically lauroyl chloride, under controlled conditions. The esterified sponge has a bulk density of 0.5-3g/cm3.
Inventors
- 👤 James Teng
- 👤 Marcella C Stubits
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:57
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; A; A47; A47L; A47L13/00; A47L13/10; A47L13/16; B; B01; B01D; B01D17/00; B01D17/02; B01D17/0202; C02; C02F; C02F1/00; C02F1/68; C02F1/681; C08B; C08B3/00; C08B3/08; C08B3/10; C11; C11B; C11B13/00; C08J2301/00; C08J2301/02; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/74; Y10; Y10S; Y10S210/00; Y10S210/918; Y10S210/922; Y10S210/924
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
70 words
A METHOD OF REMOVING A LIPID FROM THE SURFACE OF AN IMMISCIBLE FLUID COMPRISING THE STEPS OF PLACING A LIPOPHILIC CELLULOSE FATTY ACID ESTER SPONGE HAVING A BULK DENSITY OF ABOUT 0.05 G/CM3, AND A DEGRE OF SUBSTITUTION OF ABOUT 1.5 TO ABOUT 2.9 AND WHEREIN THE FATTY ACID ESTER IS OF C8 -C18 CHAIN LENGTH, INTO THE LIPID, DRAWING LIPID INTO THE SPONGE, AND REMOVING THE LIPID FILLED SPONGE.
Claim 2
Independent Claim
70 words
A METHOD OF REMOVING A LIPID FROM THE SURFACE OF AN IMMISCIBLE FLUID COMPRISING THE STEPS OF PLACING A LIPOPHILIC CELLULOSE FATTY ACID ESTER SPONGE HAVING A BULK DENSITY OF ABOUT 0.05 G/CM3, AND A DEGRE OF SUBSTITUTION OF ABOUT 1.5 TO ABOUT 2.9 AND WHEREIN THE FATTY ACID ESTER IS OF C8 -C18 CHAIN LENGTH, INTO THE LIPID, DRAWING LIPID INTO THE SPONGE, AND REMOVING THE LIPID FILLED SPONGE.
Claim 3
Dependent Claim
15 words
The method of claim 1 including the step of extracting the lipid from the sponge.
Claim 4
Dependent Claim
12 words
The method of claim 2 including the step of reusing the sponge.
Claim 5
Dependent Claim
16 words
The method of claim 1 wherein the lipid is selected from beef, chicken and pork fat.
Claim 6
Dependent Claim
11 words
The method of claim 1 wherein the sponge is cellulose laurate.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |