Patent US3639345A successfully refreshed from Google Patents.
US3639345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shelf-stable epoxy resin composition of epoxy resin and adduct of trimellitic anhydride and polyalkylene glycol
Assignee: 3M Co
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Filing: 1969-11-28
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Granted: 1972-02-01
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Expires: 1989-11-28
Abstract
Abstract SHELF-STABLE EPOXY RESIN COMPOSITION THAT CAN BE PULVERIZED TO A DRY POWDER FOR FLUIDIZED BED OR DRY SPRAYCOATING OF HEATED OBJECTS TO PROVIDE THROUGH FLEXIBLE PROTECTIVE COATINGS. THE COMPOSITION COMPRISES A HIGH-MELTING DIGLYCIDYL ETHER OF A DIHYDRIC PHENOL AND AN ADDUCT ONE MOL OF TRIMELLITIC ANHYDRIDE PER HYDROXYL EQUIVALENT OF A POLYALKYLENE GLYCOL, ESPECIALLY POLYETHYLENE GLYCOL.
Inventors
- 👤 Charles A Whittemore
- 👤 Robert E Spangler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:07
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4246; C08G59/4269; Y; Y10; Y10S; Y10S525/00; Y10S525/934
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |