US3575919A
Expired / Lapsed
US
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Method for continuous pigmentation of polyesters in a continuous condensation process
Assignee: Inventa AG fuer Forschung und Patentverwertung
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Filing: 1969-05-12
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Granted: 1971-04-20
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Expires: 1989-05-12
Abstract
Abstract A METHOD FOR THE PIGMENTATION OF A POLYESTER IN A CONTINUOUS POLYMERIZATION PROCESS IS DISCLOSED. THE POLYESTER IS CONDENSED TO FORM A STREAM OF PRECONDENSATE. THE PRECONDENSATE IS THEN FURTHER CONDENSED TO FORM A STREAM OF HIGH POLYCONDENSATE. A PARTIAL STREAM OF HIGH POLYCONDENSATE IS BRANCHED OFF FROM THE HIGH POLYCONDENSATE STREAM AND PIGMENTED. THE PIGMENTED PARTIAL STREAM IS THEN COMBINED AND MIXED WITH THE PRECONDENSATE STREAM. ALTERNATIVELY, THE PIGMENTED PARTIAL STREAM IS POLYCONDENSED, THEN COMBINED AND MIXED WITH THE HIGH POLYCONDENSATE STREAM.
Inventors
- 👤 Walter Busweiler
- 👤 Heinz Schatzle
- 👤 Bernhard Stoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:01
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/22; C08J3/226; C08G; C08G63/00; C08G63/78; C08L; C08L67/00; C08J2367/00; C08J2467/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |