Patent US3936269A successfully refreshed from Google Patents.
US3936269A
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Method of cold sterilization using frozen dimethyl dicarbonate
Assignee: Logica International Corp
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Filing: 1974-11-25
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Granted: 1976-02-03
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Expires: 1994-11-25
Abstract
Abstract A method of sterilizing a perishable product by use of dimethyl dicarbonate. The dimethyl dicarbonate is stored as a solid at a temperature below 16°C and prior to use it is liquified by heating under an inert atmosphere. The liquified dimethyl dicarbonate is mixed with a perishable product, and the product is then packaged in a sealed container and immediately heated to increase the anti-microbial activity of the dimethyl dicarbonate.
Inventors
- 👤 Peter D. Bayne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:01
CPC Classifications
A; A23; A23B; A23B2/00; A23B2/70; A23B2/725; A23B2/729; A23B4/00; A23B4/10; A23B4/14; A23B4/18; A23B4/20; A23B7/00; A23B7/14; A23B7/153; A23B7/154; A23B7/16; A23B70/00; A23B70/10; C; C12; C12H; C12H1/00; C12H1/12; C12H1/14
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
79 words
A method of sterilizing a perishable material, comprising the steps of heating frozen dimethyl dicarbonate to a temperature sufficient to liquify the dimethyl dicarbonate while maintaining the dimethyl dicarbonate under an atmosphere of a dry inert gas, admixing the liquified dimethyl dicarbonate with a perishable material, immediately thereafter subjecting the perishable material to a temperature in the range of 25° to 50°C to increase the antimicrobial activity of the dimethyl dicarbonate, and thereafter cooling the material to room temperature.
Claim 2
Independent Claim
79 words
A method of sterilizing a perishable material, comprising the steps of heating frozen dimethyl dicarbonate to a temperature sufficient to liquify the dimethyl dicarbonate while maintaining the dimethyl dicarbonate under an atmosphere of a dry inert gas, admixing the liquified dimethyl dicarbonate with a perishable material, immediately thereafter subjecting the perishable material to a temperature in the range of 25° to 50°C to increase the antimicrobial activity of the dimethyl dicarbonate, and thereafter cooling the material to room temperature.
Claim 3
Dependent Claim
31 words
The method of claim 1, and including the step of packaging the perishable material in a sealed container after admixing the dimethyl dicarbonate with said material and before heating said material.
Claim 4
Dependent Claim
30 words
The method of claim 1, and including the step of maintaining the material at a temperature in the range of -5° to 13°C when the dimethyl dicarbonate is admixed therewith.
Claim 5
Dependent Claim
12 words
The method of claim 1, wherein said dry inert gas is nitrogen.
Claim 6
Dependent Claim
30 words
The method of claim 1, and including the step of maintaining the liquid dimethyl dicarbonate under the dry inert gas atmosphere while the dimethyl dicarbonate is admixed with said material.
Claim 7
Dependent Claim
21 words
The method of claim 1, wherein the dimethyl dicarbonate is heated to a temperature above 16°C to liquify the dimethyl dicarbonate.
Claim 8
Dependent Claim
22 words
The method of claim 1, wherein the dimethyl dicarbonate is admixed with said material in an amount of 1 to 1000 ppm.
Claim 9
Dependent Claim
22 words
The method of claim 7, wherein the dimethyl dicarbonate is admixed with said material in an amount of 25 to 200 ppm.
Claim 10
Independent Claim
89 words
A method of sterilizing a perishable material, comprising the steps of heating frozen dimethyl dicarbonate to a temperature sufficiently high to melt the dimethyl dicarbonate while maintaining the dimethyl dicarbonate under an inert atmosphere, admixing an effective sterilizing amount of the liquified dimethyl dicarbonate with a perishable material, packaging the perishable material in a sealed container, immediately thereafter subjecting the perishable material to a temperature in the range of 25° to 50°C to increase the antimicrobial activity of the dimethyl dicarbonate, and thereafter cooling the material to room temperature.
Claim 11
Independent Claim
89 words
A method of sterilizing a perishable material, comprising the steps of heating frozen dimethyl dicarbonate to a temperature sufficiently high to melt the dimethyl dicarbonate while maintaining the dimethyl dicarbonate under an inert atmosphere, admixing an effective sterilizing amount of the liquified dimethyl dicarbonate with a perishable material, packaging the perishable material in a sealed container, immediately thereafter subjecting the perishable material to a temperature in the range of 25° to 50°C to increase the antimicrobial activity of the dimethyl dicarbonate, and thereafter cooling the material to room temperature.
Claim 12
Dependent Claim
35 words
The method of claim 9, wherein the perishable material is a liquid having an aqueous phase, and the liquified dimethyl dicarbonate is admixed with said material by dissolving said dimethyl dicarbonate in said aqueous phase.
Claim 13
Dependent Claim
23 words
The method of claim 9, wherein said material is at a temperature of -5° to 13°C when the dimethyl dicarbonate is admixed therewith.
Claim 14
Dependent Claim
44 words
The method of claim 9, wherein the perishable material is freshly extracted citrus fruit juice, and said method includes the step of adding to said perishable material along with said dimethyl dicarbonate, a proteolytic enzyme and a pectinase having a high level of polygalacturonase.
Claim 15
Dependent Claim
22 words
The method of claim 12, wherein the proteolytic enzyme is a member selected from the group consisting of ficin, papain, and bromelin.
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) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |