Patent US2839477A successfully refreshed from Google Patents.
US2839477A
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Table ii
Assignee: —
•
Filing: —
•
Granted: 1958-06-17
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Expires: 1975-06-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:42
CPC Classifications
C; C11; C11D; C11D1/00; C11D1/66; C11D1/722
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A COGENERIC MIXTURE OF OXYALKYLATION DERIVATIVES OF A MEMBER OF THE CLASS CONSISTING OF 2-METHYL-2,4-PENTANEDIOL AND ITS LOW STAGE OXYETHYLATION ADDITION PRODUCTS; SAID LOW STAGE OXYETHYLATION STEP INVOLVING NOT MORE THAN 4 MOLES OF ETHYLENE OXIDE PER MOLE OF 2-METHYL-2,4PENTANEDIOL, FOLLOWED BY CONVERSION INTO A SURFACE ACTIVE MIXTURE, SAID CONVERSION INTO A SURFACE ACTIVE MIXTURE BEING BY VIRTUE OF A FIRST STAGE OXYALKYLATION INVOLVING (A) AT LEAST ONE MEMBER OF THE CLASS CONSISTING OF PROPYLENE OXIDE AND BUTYLENE OXIDE TO PROVIDE AN INTERMEDIATE AND A SECOND STAGE OXYALKYLATION INVOLVING (B) ETHYLENE OXIDE, SAID INTERMEDIATE PRIOR TO OXYETHYLATION BEING CHARACTERIZED BY WATER INSOLUBILITY, SAID FINAL PRODUCT BEING CHARACTERIZED BY THE FACT THAT HYDROPHOBE PROPERTY OF THE INTERMEDIATE IS OFFSET TO A SIGNIFICANT DEGREE BY THE FINAL STAGE OXYETHYLATION, THE AVERAGE MOLECULAR WEIGHT OF SAID COGENERIC MIXTURE BEING NOT OVER 10,000, AND NOT LESS THAN 400.
Claim 2
Dependent Claim
144 words
A COGENERIC MIXTURE OF OXYALKYLATION DERIVATIVES OF A MEMBER OF THE CLASS CONSISTING OF 2-METHYL-2,4-PENTANEDIOL AND ITS LOW STAGE OXYETHYLATION ADDITION PRODUCTS; SAID LOW STAGE OXYETHYLATION STEP INVOLVING NOT MORE THAN 4 MOLES OF ETHYLENE OXIDE PER MOLE OF 2-METHYL-2,4PENTANEDIOL, FOLLOWED BY CONVERSION INTO A SURFACE ACTIVE MIXTURE, SAID CONVERSION INTO A SURFACE ACTIVE MIXTURE BEING BY VIRTUE OF A FIRST STAGE OXYALKYLATION INVOLVING (A) AT LEAST ONE MEMBER OF THE CLASS CONSISTING OF PROPYLENE OXIDE AND BUTYLENE OXIDE TO PROVIDE AN INTERMEDIATE AND A SECOND STAGE OXYALKYLATION INVOLVING (B) ETHYLENE OXIDE, SAID INTERMEDIATE PRIOR TO OXYETHYLATION BEING CHARACTERIZED BY WATER INSOLUBILITY, SAID FINAL PRODUCT BEING CHARACTERIZED BY THE FACT THAT HYDROPHOBE PROPERTY OF THE INTERMEDIATE IS OFFSET TO A SIGNIFICANT DEGREE BY THE FINAL STAGE OXYETHYLATION, THE AVERAGE MOLECULAR WEIGHT OF SAID COGENERIC MIXTURE BEING NOT OVER 10,000, AND NOT LESS THAN 400.
References Cited (Backward Citations)
US2536685A
Cited
US2674619A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |