Patent US2940828A successfully refreshed from Google Patents.
Patent US2641593A successfully refreshed from Google Patents.
US2641593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide resins
Assignee: United States Department of Agriculture
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Filing: 1950-03-27
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Granted: 1953-06-09
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Expires: 1970-03-27
Abstract
No abstract record available.
Inventors
- 👤 Howard M Teeter
- 👤 John C Cowan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:38
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A PROCESS FOR PRODUCING A SYNTHETIC RESIN COMPRISING REACTING ONE MOLECULAR PROPORTION OF AN ADDUCT OF THE GROUP CONSISTING OF AN UNSATURATED FATTY ACID CONTAINING AT LEAST 7 CARBON ATOMS, AND ESTER OF SUCH AN ACID, MIXTURES OF SAID ACIDS, AND MIXTURES OF SAID ESTERS, WITH AN ANHYDRIDE SELECTED FROM THE GROUP CONSISTING OF CITRACONIC ANHYDRIDE AND ITACONIC ANHYDRIDE, WITH APPROXIMATELY FIVE MOLECULAR PROPORTIONS OF A HYDROCARBON PRIMARY DIAMINE AT A TEMPERATURE OF FROM 100* C. TO 200* C. UNTIL A FUSIBLE LINEAR RESIN IS FORMED, THE UNSATURATION OF SAID ACID AND ESTER BEING ETHYLENE BONDS SOLELY.
Claim 2
Dependent Claim
97 words
A PROCESS FOR PRODUCING A SYNTHETIC RESIN COMPRISING REACTING ONE MOLECULAR PROPORTION OF AN ADDUCT OF THE GROUP CONSISTING OF AN UNSATURATED FATTY ACID CONTAINING AT LEAST 7 CARBON ATOMS, AND ESTER OF SUCH AN ACID, MIXTURES OF SAID ACIDS, AND MIXTURES OF SAID ESTERS, WITH AN ANHYDRIDE SELECTED FROM THE GROUP CONSISTING OF CITRACONIC ANHYDRIDE AND ITACONIC ANHYDRIDE, WITH APPROXIMATELY FIVE MOLECULAR PROPORTIONS OF A HYDROCARBON PRIMARY DIAMINE AT A TEMPERATURE OF FROM 100* C. TO 200* C. UNTIL A FUSIBLE LINEAR RESIN IS FORMED, THE UNSATURATION OF SAID ACID AND ESTER BEING ETHYLENE BONDS SOLELY.
References Cited (Backward Citations)
US2149286A
Cited
US2366128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |