Patent US3296157A successfully refreshed from Google Patents.
US3296157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing and separating epoxide resins
Assignee: Individual
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Filing: 1962-04-05
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Granted: 1967-01-03
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Expires: 1982-04-05
Abstract
No abstract record available.
Inventors
- 👤 Brojer Zbigniew
- 👤 Penczek Piotr Andrzej
- 👤 Sas Jerzy Henryk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:18
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/02; C08G59/04; C08G59/06; C08G59/063
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
IN A METHOD OF MANUFACTURING AND SEPARATING EPOXIDE RESINS OF A SOFTENING POINT OF 50*C-160*C. BY CONDENSATION OF BISPHENOL-A WITH A CHLOROHYDRIN SELECTED FROM THE GROUP WHICH CONSISTS OF GLYCEROL DICHLOROHYDRIN AND EPICHLOROHYDRIN, CARRIED OUT IN A MEDIUM OF AQUEOUS CAUSTIC ALKALI, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT SAID CONDENSATION BY MIXING AND HEATING TO A TEMPERATURE OF ABOUT 40*C. TO 100*C. SAID BISPHENOLA WITH SAID CHLOROHYDRIN IN THE PRESENCE OF A WATERSOLUBLE ORGANIC POLYMR SELECTED FROM THE GROUP WHICH CONSISTS OF POLYVINYL ALCOHOL AND THE SODIUM SALT OF CARBOXYMETHYCELLULOSE, IN A MINUTE AMOUNT EFFECTIVE TO FORM A PROTECTIVE COLLOID FOR SAID EPOXIDE RESIN BUT NOT LESS THAN 0.02% BY WEIGHT BASED ON SAID BISPHENOL-A, WHEREBY SAID EPOXIDE RESIN IS OBTAINED AS A SUSPENSION OF EASILY STIRRABLE BEADS.
Claim 2
Dependent Claim
128 words
IN A METHOD OF MANUFACTURING AND SEPARATING EPOXIDE RESINS OF A SOFTENING POINT OF 50*C-160*C. BY CONDENSATION OF BISPHENOL-A WITH A CHLOROHYDRIN SELECTED FROM THE GROUP WHICH CONSISTS OF GLYCEROL DICHLOROHYDRIN AND EPICHLOROHYDRIN, CARRIED OUT IN A MEDIUM OF AQUEOUS CAUSTIC ALKALI, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT SAID CONDENSATION BY MIXING AND HEATING TO A TEMPERATURE OF ABOUT 40*C. TO 100*C. SAID BISPHENOLA WITH SAID CHLOROHYDRIN IN THE PRESENCE OF A WATERSOLUBLE ORGANIC POLYMR SELECTED FROM THE GROUP WHICH CONSISTS OF POLYVINYL ALCOHOL AND THE SODIUM SALT OF CARBOXYMETHYCELLULOSE, IN A MINUTE AMOUNT EFFECTIVE TO FORM A PROTECTIVE COLLOID FOR SAID EPOXIDE RESIN BUT NOT LESS THAN 0.02% BY WEIGHT BASED ON SAID BISPHENOL-A, WHEREBY SAID EPOXIDE RESIN IS OBTAINED AS A SUSPENSION OF EASILY STIRRABLE BEADS.
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) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |