US3947325A
Expired / Lapsed
US
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Preparation of high permeability cellulose fibers containing enzymes
Assignee: Anic SpA
•
Filing: 1974-04-11
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Granted: 1976-03-30
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Expires: 1994-04-11
Abstract
Abstract High permeability cellulose fibers containing enzymes are formed by preparing a solution of nitrocellulose in a solvent that is insoluble in water, preparing an aqueous enzyme solution, mixing together the nitrocellulose and enzyme solutions and emulsifying the mixture, spinning the emulsion into a coagulating bath to produce fibers englobing enzymes and treating the fibers with a reducing agent under conditions which do not damage the enzymes so that nitro groups are removed from the nitrocellulose.
Inventors
- 👤 Dino Dinelli
- 👤 Francesco Bartoli
- 👤 Silvio Gulinelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:56
CPC Classifications
C; C12; C12N; C12N11/00; C12N11/02; C12N11/04; D; D01; D01F; D01F11/00; D01F11/02; D01F2/00; D01F2/06; D01F2/08; D01F2/10; D01F2/24; D01F2/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
The process of preparing cellulose fibers of high permeability containing englobed enzymatic material adapted to exert catalytic activity in enzymatic reactions, which consists of the steps of dissolving nitrocellulose in a solvent which is insoluble in water, preparing an aqueous solution of said enzymatic material, emulsifying said solutions, spinning said emulsion into a coagulating bath to produce nitrocellulose fibers containing englobed enzymatic material, and then treating said fibers with a reducing agent under operating conditions which do not damage the enzymatic material so that nitro groups are removed from said nitrocellulose.
Claim 2
Dependent Claim
91 words
The process of preparing cellulose fibers of high permeability containing englobed enzymatic material adapted to exert catalytic activity in enzymatic reactions, which consists of the steps of dissolving nitrocellulose in a solvent which is insoluble in water, preparing an aqueous solution of said enzymatic material, emulsifying said solutions, spinning said emulsion into a coagulating bath to produce nitrocellulose fibers containing englobed enzymatic material, and then treating said fibers with a reducing agent under operating conditions which do not damage the enzymatic material so that nitro groups are removed from said nitrocellulose.
Claim 3
Dependent Claim
29 words
A process as claimed in claim 1, wherein the reducing agent is an ammonium sulfhydrate solution or a mixture thereof with a slight excess of ammonia or hydrogen sulphide.
Claim 4
Dependent Claim
26 words
A process as claimed in claim 1, wherein said solvent insoluble in water is a member of the group consisting of n-butylacetate, bis-butylphtalate, methyl-amylketone and ethylamylketone.
Claim 5
Dependent Claim
30 words
A process as claimed in claim 1, wherein said solvent insoluble in water contains a diluent selected from the group consisting of aliphatic hydrocarbons, aromatic hydrocarbons and mixtures of hydrocarbons.
Claim 6
Dependent Claim
33 words
A process as claimed in claim 1, wherein the englobed enzymatic material is a member of the group consisting of urease, invertase, lactase, acylase, transaminase, glucose-oxidase, catalase, papain, tryptophan synthetase and penicillin acylase.
References Cited (Backward Citations)
GB953414A
Cited
US3715277A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |