Patent US3269975A successfully refreshed from Google Patents.
US3269975A
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Tetracarboxylic acid hardeners for epoxy resins and powdered epoxy resin compositions including such hardeners
Assignee: Hysol Corp
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Filing: 1963-07-09
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Granted: 1966-08-30
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Expires: 1983-07-09
Abstract
No abstract record available.
Inventors
- 👤 Max M Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:59
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4223; Y; Y10; Y10S; Y10S524/00; Y10S524/904
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A RESIN COMPOSITION FOR PRODUCING COATINGS OF ENHANCED TOUGHNESS AND FLEXIBLIITY, SAID COMPOSITION BEING IN THE FORM OF A FREE FLOWING POWDER ADAPTED FOR FLUIDIZED BED AND DRY SPRAY APPLICATION TO HEATED OBJECTS TO COAT SUCH OBJECTS, SAID POWDER HAVING A PARTICLE SIZE PRIMARILY WITHIN THE RANGE OF 5 TO 400 MICRONS AND COMPRISING A MIXTURE OF PARTICLES OF A FUSIBLE SOLID REACTION PRODUCT OF EPICHLOROHYDRIN WITH DIHYDRIC PHENOL HAVING AN EPOXIDE EQUIVALENT GREATER THAN 1.0, AND HAVING A MELTING POINT WITHIN THE RANGE OF ABOUT 65-130*C. AND PARTICLES OF A HARDENER IN THE PROPORTIIONS OF ABOUT 0.1 TO 0.35 PART OF HARDENER PER PART BY WEIGHT OF RESIN, SAID HARDENER CONSISTING OF THE SOLID TETRACARBOXYLIC REACTION PRODUCT OF TWO MOLS OF TRIMELLITIC ANHYDRIDE AND ONE MOL OF A DIHYDRIC ALCOHOL SELECTED FROM THE GROUP CONSISTING OF DIETHYLENE TO PENTAETHYLENE GLYCOLS, DIPROPYLENE TO TRIPROPYLENE GLYCOLS, AND C5 TO C8 ALKANE DIOLS.
Claim 2
Dependent Claim
151 words
A RESIN COMPOSITION FOR PRODUCING COATINGS OF ENHANCED TOUGHNESS AND FLEXIBLIITY, SAID COMPOSITION BEING IN THE FORM OF A FREE FLOWING POWDER ADAPTED FOR FLUIDIZED BED AND DRY SPRAY APPLICATION TO HEATED OBJECTS TO COAT SUCH OBJECTS, SAID POWDER HAVING A PARTICLE SIZE PRIMARILY WITHIN THE RANGE OF 5 TO 400 MICRONS AND COMPRISING A MIXTURE OF PARTICLES OF A FUSIBLE SOLID REACTION PRODUCT OF EPICHLOROHYDRIN WITH DIHYDRIC PHENOL HAVING AN EPOXIDE EQUIVALENT GREATER THAN 1.0, AND HAVING A MELTING POINT WITHIN THE RANGE OF ABOUT 65-130*C. AND PARTICLES OF A HARDENER IN THE PROPORTIIONS OF ABOUT 0.1 TO 0.35 PART OF HARDENER PER PART BY WEIGHT OF RESIN, SAID HARDENER CONSISTING OF THE SOLID TETRACARBOXYLIC REACTION PRODUCT OF TWO MOLS OF TRIMELLITIC ANHYDRIDE AND ONE MOL OF A DIHYDRIC ALCOHOL SELECTED FROM THE GROUP CONSISTING OF DIETHYLENE TO PENTAETHYLENE GLYCOLS, DIPROPYLENE TO TRIPROPYLENE GLYCOLS, AND C5 TO C8 ALKANE DIOLS.
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) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |