US3242161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acetals of dialdehyde polysaccharides
Assignee: Bayer Corp
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Filing: 1961-10-16
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Granted: 1966-03-22
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Expires: 1981-10-16
Abstract
No abstract record available.
Inventors
- 👤 Peter J Borchert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:43
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/18; C08B31/185
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A NON-CROSS-LINKED ACETAL OF A DIALDEHYDE POLYSACCHARIDE RESULTING FROM THE REACTION OF A DIALDEHYDE POLYSACCHARIDE WITH FROM ABOUT 5 TO 30 MOLES PER MOLE OF DIALDEHYDE POLYSACCHARIDE POLYMER UNIT OF AN ALCOHOL SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL AND ALLYL ALCOHOL IN THE PRESENCE OF FROM ABOUT 4 MOLE PERCENT TO 20 MOLE PERCENT BASED UPON THE DIALDEHYDE POLYSACCHARIDE POLYMER UNIT OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF SULFURIC ACID AND P-TOLUENESULFONIC ACID AT A TEMPERATURE OF FROM ABOUT 60*C. TO 105*C. FOR FROM 1 HOUR TO 20 HOURS, SAID ACETAL BEING SOLUBLE IN BENZENE, TOLUENE, ETHYLENE GLYCOL MONOMETHYL ETHER, ETHYLENE GLYCOL MONOBUTYL ETHER, ACETONE, METHYL ETHYL KETONE, PROPYL ACETATE, CHLOROFORM, DIMETHYLFORMAMIDE, DIOXANE AND THE ALCOHOL FROM WHICH PREPARED AND INSOLUBLE IN WATER AND OTHER PRIMARY AND SECONDARY ALCOHOLS.
Claim 2
Dependent Claim
133 words
A NON-CROSS-LINKED ACETAL OF A DIALDEHYDE POLYSACCHARIDE RESULTING FROM THE REACTION OF A DIALDEHYDE POLYSACCHARIDE WITH FROM ABOUT 5 TO 30 MOLES PER MOLE OF DIALDEHYDE POLYSACCHARIDE POLYMER UNIT OF AN ALCOHOL SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL AND ALLYL ALCOHOL IN THE PRESENCE OF FROM ABOUT 4 MOLE PERCENT TO 20 MOLE PERCENT BASED UPON THE DIALDEHYDE POLYSACCHARIDE POLYMER UNIT OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF SULFURIC ACID AND P-TOLUENESULFONIC ACID AT A TEMPERATURE OF FROM ABOUT 60*C. TO 105*C. FOR FROM 1 HOUR TO 20 HOURS, SAID ACETAL BEING SOLUBLE IN BENZENE, TOLUENE, ETHYLENE GLYCOL MONOMETHYL ETHER, ETHYLENE GLYCOL MONOBUTYL ETHER, ACETONE, METHYL ETHYL KETONE, PROPYL ACETATE, CHLOROFORM, DIMETHYLFORMAMIDE, DIOXANE AND THE ALCOHOL FROM WHICH PREPARED AND INSOLUBLE IN WATER AND OTHER PRIMARY AND SECONDARY ALCOHOLS.
References Cited (Backward Citations)
US3032550A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |