US4305837A
Expired / Lapsed
US
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Stabilized aqueous enzyme composition
Assignee: Procter and Gamble Co
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Filing: 1980-10-30
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Granted: 1981-12-15
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Expires: 2000-10-30
Abstract
Abstract Stabilized aqueous enzyme compositions contain a stabilizing system comprising calcium ions and a low molecular weight carboxylic acid or salt, preferably a formate, preferably with a low molecular weight alcohol, and in a pH range of from about 6.5 to about 10. Most preferred is a detergent composition containing the stabilized enzymes.
Inventors
- 👤 George J. Kaminsky
- 👤 Ronald S. Christy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:29
CPC Classifications
C; C12; C12N; C12N9/00; C12N9/96; C11; C11D; C11D3/00; C11D3/16; C11D3/38; C11D3/386; C11D3/38663; C12N9/14; C12N9/48; C12N9/50; C12N9/52
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
116 words
A stabilized aqueous enzyme composition consisting essentially of: (a) from 0% to about 75% of a detergent surfactant selected from the group consisting of nonionic, anionic, cationic, zwitterionic, amphoteric and semi-polar nonionic surfactants and mixtures thereof; (b) from about 0.025% to about 10% pure proteolytic enzyme; (c) from 0 to about 60% of a low molecular weight primary or secondary alcohol; (d) from about 3% to about 10% of a water soluble formate; (e) a soluble calcium salt to give from about 2 to about 10 millimoles of calcium ion per liter; (f) triethanolamine as an alkaline buffering agent; and (g) the balance water, the pH of the product being from about 8.5 to about 10.
Claim 2
Dependent Claim
116 words
A stabilized aqueous enzyme composition consisting essentially of: (a) from 0% to about 75% of a detergent surfactant selected from the group consisting of nonionic, anionic, cationic, zwitterionic, amphoteric and semi-polar nonionic surfactants and mixtures thereof; (b) from about 0.025% to about 10% pure proteolytic enzyme; (c) from 0 to about 60% of a low molecular weight primary or secondary alcohol; (d) from about 3% to about 10% of a water soluble formate; (e) a soluble calcium salt to give from about 2 to about 10 millimoles of calcium ion per liter; (f) triethanolamine as an alkaline buffering agent; and (g) the balance water, the pH of the product being from about 8.5 to about 10.
Claim 3
Dependent Claim
46 words
The composition of claim 1 containing from about 5% to about 15% of said alcohol; from about 4% to about 8% of sodium formate; and from about 4 to about 8 millimoles of calcium ion per liter, the pH being from about 9 to about 9.5.
Claim 4
Dependent Claim
23 words
The composition of claim 2 wherein the alcohol is selected from the group consisting of methanol, ethanol, propanol, and isopropanol, and mixtures thereof.
Claim 5
Dependent Claim
20 words
The composition of claim 3 wherein the surfactant is present in an amount of from about 20% to about 50%.
Claim 6
Dependent Claim
17 words
The composition of claim 3 wherein the detergent surfactant is a mixture of anionic and nonionic surfactants.
Claim 7
Dependent Claim
17 words
The composition of claim 3 wherein the detergent surfactant is a mixture of nonionic and cationic surfactants.
Claim 8
Dependent Claim
18 words
The composition of claim 3 wherein the detergent surfactant is a mixture of nonionic and semi-polar nonionic surfactants.
Claim 9
Dependent Claim
11 words
The composition of claim 3 wherein the alcohol is ethyl alcohol.
Claim 10
Dependent Claim
52 words
The composition of claim 3 wherein the proteolytic enzyme is present at a level of from about 0.05% to about 0.2% to give a level of enzyme activity of from about 15 to about 60 Anson units per liter, and wherein the enzyme has an isoelectric point of at least about 8.5.
Claim 11
Dependent Claim
12 words
The composition of claim 3 which is substantially free of carbonate ions.
References Cited (Backward Citations)
US3325364A
Cited
US3557002A
Cited
US3676374A
Cited
US3893955A
Cited
US4111855A
Cited
US4243546A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-14 | 1985-06-15 | 1985-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-14 | 1989-06-15 | 1989-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-14 | 1993-06-15 | 1993-12-15 | $7700.00 | Window Closed / Lapsed |