Patent US4123426A successfully refreshed from Google Patents.
US4123426A
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Process for decomposing microbial cells
Assignee: Daiichi Kasei Sangyo Co Ltd
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Filing: 1977-08-02
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Granted: 1978-10-31
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Expires: 1997-08-02
Abstract
Abstract Foamable hydrolyzed proteins substantially free from lipid, nucleic acids, and nucleic acid related substances are obtained by decomposing microbial cells with an alkaline aqueous solution containing an alkaline earth metal hydroxide and an alkali metal hydroxide. The hydrolyzed proteins are useful as foaming agents, especially fire-extinguishing foams effective against fires of oils. The starting microbial cells are available at low cost in great quantities.
Inventors
- 👤 Masao Katayama
- 👤 Yataro Tabeta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:10
CPC Classifications
C; C12; C12N; C12N1/00; C12N1/005; A; A01; A01N; A01N59/00; Y; Y10; Y10S; Y10S530/00; Y10S530/82; Y10S530/823; Y10S530/824; Y10S530/825; Y10S530/859
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
111 words
A process for decomposing microbial cells to obtain foamable hydrolyzed proteins, which comprises treating the microbial cells with an alkaline aqueous solution containing an alkaline earth metal hydroxide and an alkali metal hydroxide, said alkaline earth metal hydroxide being at least one compound selected from the group consisting of calcium hydroxide, barium hydroxide and magnesium hydroxide, and said alkali metal hydroxide being at least one compound selected from the group consisting of sodium hydroxide and potassium hydroxide, the alkaline earth metal hydroxide being 15 to 50% by weight and the amount of the alkali metal hydroxide being 2 to 20% by weight, both based on the weight of the microbial cells.
Claim 2
Dependent Claim
111 words
A process for decomposing microbial cells to obtain foamable hydrolyzed proteins, which comprises treating the microbial cells with an alkaline aqueous solution containing an alkaline earth metal hydroxide and an alkali metal hydroxide, said alkaline earth metal hydroxide being at least one compound selected from the group consisting of calcium hydroxide, barium hydroxide and magnesium hydroxide, and said alkali metal hydroxide being at least one compound selected from the group consisting of sodium hydroxide and potassium hydroxide, the alkaline earth metal hydroxide being 15 to 50% by weight and the amount of the alkali metal hydroxide being 2 to 20% by weight, both based on the weight of the microbial cells.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the microbial cells are untreated microbial cells.
Claim 4
Dependent Claim
58 words
The process of claim 1 which further includes removing the hydrolysis residue from the alkaline aqueous solution, adjusting the pH of the filtrate to 3-7.5, coagulating and separating the unreacted proteins, adding a carbonic acid compound to the supernatant liquid under alkalinity, and separating and removing the dissolved alkaline earth metal compound as an alkaline earth metal carbonate.
Claim 5
Dependent Claim
15 words
The process of claim 3 wherein the carbonic acid compound is a carbonate of ammonium.
References Cited (Backward Citations)
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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) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |