Patent US3901874A successfully refreshed from Google Patents.
US3901874A
Expired / Lapsed
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Modification of carbohydrates
Assignee: PETER STRONG RESEARCH AND DEV
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Filing: 1973-11-20
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Granted: 1975-08-26
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Expires: 1993-11-20
Abstract
Abstract Carbohydrates or polysaccharides are treated to provide conversion products by means of acid agents, preferably surfactant sulfonic acids, in so-called ''''wet methods'''' or ''''dry methods''''. Free-flowing, particulate mixes are used which serve to increase the efficiency of the process.
Inventors
- 👤 William H Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:50
CPC Classifications
C; C08; C08B; C08B37/00; C08B15/00; C08B30/00; C08B30/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
149 words
A PROCESS OF DEPOLYMERIZING A CARBOHYDRATE COMPRISING MIXING A CARBOHYDRATE SELECTED FROM A GROUP CONSISTING OF STRACH, CELLULOSE, HEMICELLULOSE, AND NATURAL PLANT HYDROCOLLOID, AND NONPOROUS PARTICLES OF COLLOIDAL, PYROGENIC SILICA COATED WITH A SURFACTANT, ORGANIC ACID SELECTED FROM A GROUP CONSISTING OF SULFONIC ACID HAVING AN ALKYL RADICAL WITH 10 TO 20 CARBON ATOMS, AND SULFONIC ACID HAVING AN AKYLBENZENE GROUP IN WHICH THE ALKYL GROUP HAS TEN TO TWENTY CARBON ATOMS, THE COATED PARTICLES HAVING FROM TWO PARTS BY WEIGHT OF THE SAID ACID AND ONE PART BY WEIGHT OF SAID SILICA TO ONE PART BY WEIGHT OF SAID ACID AND TWO PARTS BY WEIGHT OF SAID SILICA, AND THE SAID ACID BEING PRESENT IN THE RESULTING MIX TO THE EXTENT OF 0.1% TO ABOUT 10% BY WEIGHT, THE SAID MIX BEING HEATED IN THE RANGE OF ABOUT 25*C. TO ABOUT 120*C., WHEREBY THE SAID CARBOHYDRATE IS DEPOLYMERIZED.
Claim 2
Dependent Claim
149 words
A PROCESS OF DEPOLYMERIZING A CARBOHYDRATE COMPRISING MIXING A CARBOHYDRATE SELECTED FROM A GROUP CONSISTING OF STRACH, CELLULOSE, HEMICELLULOSE, AND NATURAL PLANT HYDROCOLLOID, AND NONPOROUS PARTICLES OF COLLOIDAL, PYROGENIC SILICA COATED WITH A SURFACTANT, ORGANIC ACID SELECTED FROM A GROUP CONSISTING OF SULFONIC ACID HAVING AN ALKYL RADICAL WITH 10 TO 20 CARBON ATOMS, AND SULFONIC ACID HAVING AN AKYLBENZENE GROUP IN WHICH THE ALKYL GROUP HAS TEN TO TWENTY CARBON ATOMS, THE COATED PARTICLES HAVING FROM TWO PARTS BY WEIGHT OF THE SAID ACID AND ONE PART BY WEIGHT OF SAID SILICA TO ONE PART BY WEIGHT OF SAID ACID AND TWO PARTS BY WEIGHT OF SAID SILICA, AND THE SAID ACID BEING PRESENT IN THE RESULTING MIX TO THE EXTENT OF 0.1% TO ABOUT 10% BY WEIGHT, THE SAID MIX BEING HEATED IN THE RANGE OF ABOUT 25*C. TO ABOUT 120*C., WHEREBY THE SAID CARBOHYDRATE IS DEPOLYMERIZED.
Claim 3
Dependent Claim
98 words
A process of depolymerizing a carbohydrate comprising mixing a carbohydrate selected from a group consisting of starch, cellulose, hemicellulose, and natural plant hydrocolloid in the presence of an organic surfactant acid selected from a group consisting of sulfonic acid having an alkyl radical with 10 to 20 carbon atoms, and sulfonic acid having an alkylbenzene group in which the alkyl group has ten to twenty carbon atoms, at a temperature of about 50* C. to about 120* C., the resulting mix containing about 0.1% to about 10% by weight of said acid, whereby the said carbohydrate is depolymerized.
Claim 4
Dependent Claim
98 words
A process of depolymerizing a carbohydrate comprising mixing a carbohydrate selected from a group consisting of starch, cellulose, hemicellulose, and natural plant hydrocolloid in the presence of an organic surfactant acid selected from a group consisting of sulfonic acid having an alkyl radical with 10 to 20 carbon atoms, and sulfonic acid having an alkylbenzene group in which the alkyl group has ten to twenty carbon atoms, at a temperature of about 50* C. to about 120* C., the resulting mix containing about 0.1% to about 10% by weight of said acid, whereby the said carbohydrate is depolymerized.
Claim 5
Dependent Claim
84 words
In a process of depolymerizing carbohydrate material, the improvement which comprises reacting a carbohydrate selected from a group consisting of starch, cellulose, hemicellulose, and natural plant hydrocolloid with a surfactant organic acid selected from a group consisting of sulfonic acid having an alkyl radical with 10 to 20 carbon atoms, and sulfonic acid having an alkylbenzene group in which the alkyl group has 10 to 20 carbon atoms at a temperature of about 50* C. to about 120* C., whereby the carbohydrate is depolymerized.
Claim 6
Dependent Claim
84 words
In a process of depolymerizing carbohydrate material, the improvement which comprises reacting a carbohydrate selected from a group consisting of starch, cellulose, hemicellulose, and natural plant hydrocolloid with a surfactant organic acid selected from a group consisting of sulfonic acid having an alkyl radical with 10 to 20 carbon atoms, and sulfonic acid having an alkylbenzene group in which the alkyl group has 10 to 20 carbon atoms at a temperature of about 50* C. to about 120* C., whereby the carbohydrate is depolymerized.
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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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |