Patent US2856387A successfully refreshed from Google Patents.
US2856387A
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Polyamides and process for preparing polyamides from alkyl substituted diamines and esters of dicarbothiolic acid
Assignee: EIDP Inc
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Filing: 1954-07-12
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Granted: 1958-10-14
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Expires: 1974-07-12
Abstract
No abstract record available.
Inventors
- 👤 Jacobson Henning Waldemar
- 👤 Martin Elmore Louis
- 👤 Sharkey William Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:08
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A HIGH MOLECULAR WEIGHT, LIGHT STABLE POLYAMIDE HAVING AN INHERENT VISCOSITY OF AT LEAST 0.75 AND BEING THE CONDENSATION PRODUCT OBTAINED BY REACTING AT A TEMPERATURE OF 50*C. TO 325*C. APPROXIMATELY EQUIMOLAR AMOUNTS OF AN ALPHA,ALPHA''-TETRAALKYL-SUBSTITUTED DIAMINE CONTAINING AT LEAST ONE HYDROGEN ON EACH AMINO GROUP AND AN ORGANIC DICARBOTHIOLATE SELECTED FROM THE GROUP CONSISTING OF DIARYL AND DIALKYL ESTERS OF A DICARBOTHIOLIC ACID IN WHICH THE CARBOTHIOLIC ACID GROUPS ARE SEPARATED BY A CHAIN OF 3 TO 10 CARBONS, INCLUSIVE.
Claim 2
Dependent Claim
81 words
A HIGH MOLECULAR WEIGHT, LIGHT STABLE POLYAMIDE HAVING AN INHERENT VISCOSITY OF AT LEAST 0.75 AND BEING THE CONDENSATION PRODUCT OBTAINED BY REACTING AT A TEMPERATURE OF 50*C. TO 325*C. APPROXIMATELY EQUIMOLAR AMOUNTS OF AN ALPHA,ALPHA''-TETRAALKYL-SUBSTITUTED DIAMINE CONTAINING AT LEAST ONE HYDROGEN ON EACH AMINO GROUP AND AN ORGANIC DICARBOTHIOLATE SELECTED FROM THE GROUP CONSISTING OF DIARYL AND DIALKYL ESTERS OF A DICARBOTHIOLIC ACID IN WHICH THE CARBOTHIOLIC ACID GROUPS ARE SEPARATED BY A CHAIN OF 3 TO 10 CARBONS, INCLUSIVE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |