US2988535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curing of epoxide resins
Assignee: Freed Transformer Co Inc
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Filing: 1955-12-21
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Granted: 1961-06-13
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Expires: 1975-12-21
Abstract
No abstract record available.
Inventors
- 👤 Robert B Feuchtbaum
- 👤 Donald L Hinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:29
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4064
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
216 words
A CURING AGENT FOR AN EPOXIDE RESIN COMPRISING A SOLVATED ASSOCIATION PRODUCT OR (A) AT LEAST ONE COMPOUND SELECTED FROM THE CLASS CONSISTING OF HETEROPOLYFUNCTIONAL AROMATIC AMPHOTERIC SUBSTANCES WHICH MELTS WITHOUT DECOMPOSITION, SAID AMPHOTERIC SELECTED FROM THE COMPOSED OF AT LEAST ONE COMPOUND SELECTED FROM THE CLASS HAVING THE FORMULA X-R-Y, WHEREIN R IS AN AROMATIC NUCLEUS HAVING UP TO AND INCLUDING 18 CYCLICALLY INCLUDED CARBON ATOMS, Y IS AT LEAST ONE FUNCTIONAL ACIDIC GROUP HAVING THE GENERAL FORMULA CA, WHERE C IS AN ALKYL GROUP HAVING FROM 3 TO 3 CARBON ATOMS AND A IS SELECTED ONLY FROM THE GROUP CONSISTING OF SULPHYDRIL AND CARBOXYL GROUPS, SAID ACIDIC GROUP BEING ATTACHED TO A CYCLICALLY INCLUDED CARBON, AND X IS AT LEAST ONE FUNCTIONAL BASIC GROUP SELECTED FROM THE CLASS CONSISTING OF HETEROCYCLIC NITROGEN ATOMS AND NUCLEUS-ATTACHED BASIC AMINO GROUPS SELECTED FROM THE CLASS CONSISTING OF NH2, NHR1 AND NR2R3 IN WHICH R1, R2 AND R3 ARE SELECTED FROM THE GROUP CONSISTING OF THE LOWER ALKYLS HAVING FROM 1 TO 5 CARBON ATOMS, AND (B) AT LEAST ONE COMPOUND SELECTED FROM THE CLASS CONSISTING OF NON-AMPHOTERIC AROMATIC PRIMARY AND SECONDARY AMINES, THE CONTENT OF MATERIAL FROM EACH OF SAID CLASSES BEING FROM 10%-90% OF SAID PRODUCT TO YIELD A CURING AGENT FLUID AT PRACTICAL CURING TEMPERATURES.
Claim 2
Dependent Claim
216 words
A CURING AGENT FOR AN EPOXIDE RESIN COMPRISING A SOLVATED ASSOCIATION PRODUCT OR (A) AT LEAST ONE COMPOUND SELECTED FROM THE CLASS CONSISTING OF HETEROPOLYFUNCTIONAL AROMATIC AMPHOTERIC SUBSTANCES WHICH MELTS WITHOUT DECOMPOSITION, SAID AMPHOTERIC SELECTED FROM THE COMPOSED OF AT LEAST ONE COMPOUND SELECTED FROM THE CLASS HAVING THE FORMULA X-R-Y, WHEREIN R IS AN AROMATIC NUCLEUS HAVING UP TO AND INCLUDING 18 CYCLICALLY INCLUDED CARBON ATOMS, Y IS AT LEAST ONE FUNCTIONAL ACIDIC GROUP HAVING THE GENERAL FORMULA CA, WHERE C IS AN ALKYL GROUP HAVING FROM 3 TO 3 CARBON ATOMS AND A IS SELECTED ONLY FROM THE GROUP CONSISTING OF SULPHYDRIL AND CARBOXYL GROUPS, SAID ACIDIC GROUP BEING ATTACHED TO A CYCLICALLY INCLUDED CARBON, AND X IS AT LEAST ONE FUNCTIONAL BASIC GROUP SELECTED FROM THE CLASS CONSISTING OF HETEROCYCLIC NITROGEN ATOMS AND NUCLEUS-ATTACHED BASIC AMINO GROUPS SELECTED FROM THE CLASS CONSISTING OF NH2, NHR1 AND NR2R3 IN WHICH R1, R2 AND R3 ARE SELECTED FROM THE GROUP CONSISTING OF THE LOWER ALKYLS HAVING FROM 1 TO 5 CARBON ATOMS, AND (B) AT LEAST ONE COMPOUND SELECTED FROM THE CLASS CONSISTING OF NON-AMPHOTERIC AROMATIC PRIMARY AND SECONDARY AMINES, THE CONTENT OF MATERIAL FROM EACH OF SAID CLASSES BEING FROM 10%-90% OF SAID PRODUCT TO YIELD A CURING AGENT FLUID AT PRACTICAL CURING TEMPERATURES.
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) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |