Patent US3689461A successfully refreshed from Google Patents.
US3689461A
Expired / Lapsed
US
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Process for the preparation of linear condensation polyesters
Assignee: Honeywell International Inc
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Filing: 1969-09-18
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Granted: 1972-09-05
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Expires: 1989-09-18
Abstract
Abstract A HIGH MOLEUCULAR WEIGHT LINEAR CONDENSATION POLYESTER IS PREPARED FROM A POLYCARBOXYLIC ACID AND A POLYOL BY (A) ESTERIFYING SAID POLYCARBOXYLIC ACID WITH SAID POLYOL BY SUBJECTING TO CONDITIONS OF DIRECT ESTERIFICATION A FLOWABLE, UNIFORM DISPERSION COMPRISED OF (1) A PASTE OF THE SAID POLYCARBOXYLIC ACID AND THE SAID POLYOL, AND (2) AT LEAST 3 PARTS BY WEIGHT PER PART PASTE OF A PARTIALLY ESTERIFIED PRODUCT OF SAID POLYCARBOXYLIC ACID WITH SAID POLYOL, AND THENCE (B) FURTHER ESTERIFYING AND POLYCONDENSING THE ESTERIFICATION PRODUCT OF STEP (A) UNTIL THERE IS OBTAINED AN IMPROVED POLYESTER OF THE DESIRED MOLECULAR WEIGHT.
Inventors
- 👤 Laszlo J Balint
- 👤 Stanley D Lazarus
- 👤 William N Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:44
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/785
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |