US3639448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing bis(beta-hydroxyethyl)-terephthalate and/or prepolymer thereof
Assignee: Mitsubishi Chemical Corp
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Filing: 1967-12-21
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Granted: 1972-02-01
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Expires: 1987-12-21
Abstract
Abstract AN IMPROVEMENT OF PROCEES FOR PRODUCING BIS(B-HYDROXYETHYL)-TEREPHTHALATE FROM TEREPHTHALIC ACID AND ETHYLENE GLYCOL IN WHICH TEREPHTHALIC ACID DISSOLVED OR DISPERESED IN A LIQUID, WHICH IS AN ALKYL TERPHTHALATE AND/OR BIS(B-HYDROXTETHYL)-TEREPHTHALATE IS REACTED WITH ETHYLENE GLYCOL AT A TEMPERATURE ABOVE THE DEW POINT OF ETHYLENE GLYCOL.
Inventors
- 👤 Katsuto Matsuzawa
- 👤 Kazuo Matsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:58
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/80; C07C69/82
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 |