Patent US1409794A successfully refreshed from Google Patents.
Patent US2613157A successfully refreshed from Google Patents.
US2613157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric plasticizers
Assignee: Individual
•
Filing: 1950-01-13
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Granted: 1952-10-07
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Expires: 1970-01-13
Abstract
No abstract record available.
Inventors
- 👤 Hogan B Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:41
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/12; C08G; C08G63/00; C08G63/02; C08G63/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS WHICH COMPRISES HEATING AT CONDENSATION TEMPERATURE APPROXIMATELY EQUIMOLECULAR PROPORTIONS OF PHTHALIC ACID ANHYDRIDE AND A MONOMERIC ESTER OF 9.10-DIHYDROXYSTEARIC ACID, AND CONTINUING SUCH HEAT UNTIL THE MAJOR PORTION OF THE PHTHALIC ACID ANHYDRIDE HAS BEEN CONVERTED TO A CONDENSATION POLYMERFORMED BY INTERACTION WITH SAID ESTER, THE ESTER BEING OF THE FORMULA X-COOR IN WHICH X-CO- IS THE ACYL RADICAL OF 9,10-DIHYDROXYSTREARIC ACID AND R IS A RADICAL OF THE GROUP CONSISTING OF ALKYL HYDROCARBON RADICALS AND THE RADICALS -CH2CH2OR'' AND -CH2CH2OCH1-CH2R" IN WHICH R'' IS A MEMBER OF THE GROUP CONSISTING OF ALKYL PHENYL, AND BENZYL HYDROCARBON RADICALS AND R" IS AN ALKYL HYDROCARBON RADICAL.
Claim 2
Dependent Claim
107 words
A PROCESS WHICH COMPRISES HEATING AT CONDENSATION TEMPERATURE APPROXIMATELY EQUIMOLECULAR PROPORTIONS OF PHTHALIC ACID ANHYDRIDE AND A MONOMERIC ESTER OF 9.10-DIHYDROXYSTEARIC ACID, AND CONTINUING SUCH HEAT UNTIL THE MAJOR PORTION OF THE PHTHALIC ACID ANHYDRIDE HAS BEEN CONVERTED TO A CONDENSATION POLYMERFORMED BY INTERACTION WITH SAID ESTER, THE ESTER BEING OF THE FORMULA X-COOR IN WHICH X-CO- IS THE ACYL RADICAL OF 9,10-DIHYDROXYSTREARIC ACID AND R IS A RADICAL OF THE GROUP CONSISTING OF ALKYL HYDROCARBON RADICALS AND THE RADICALS -CH2CH2OR'' AND -CH2CH2OCH1-CH2R" IN WHICH R'' IS A MEMBER OF THE GROUP CONSISTING OF ALKYL PHENYL, AND BENZYL HYDROCARBON RADICALS AND R" IS AN ALKYL HYDROCARBON RADICAL.
References Cited (Backward Citations)
US1815886A
Cited
US2396129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-07 | 1956-04-07 | 1956-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-07 | 1960-04-07 | 1960-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-07 | 1964-04-07 | 1964-10-07 | $7700.00 | Window Closed / Lapsed |