US3756981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the dyeing of polyurethane terephthalate granules
Assignee: Hoechst AG
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Filing: 1971-04-28
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Granted: 1973-09-04
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Expires: 1991-04-28
Abstract
Abstract A PROCESS FOR DYEING LINEAR POLYESTER GRANULES DESTINED FOR INJECTION MOULDING, WHICH COMPRISES MIXING THE POLYESTER GRANULES WITH DYESTUFF AND/OR COLOURING PIGMENTS AND A PULVERIZED ALKALI METAL SALT OF A WAX OXIDATE OR OF A POLYETHYLENE OXIDATE, WHICH PROCESS YIELDS GRANULES, ONTO WHICH THE DYESTUFF OR PIGMENTS ADHERE EXTREMELY WELL, AND WHICH GRANULES CAN BE PROCESSED INTO INJECTION MOULDED SHAPED ARTICLES SHOWING A VERY HOMOGENEOUS AND UNIFORM COLOURING.
Inventors
- 👤 S Breitschaft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:23
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/203; C08J2367/00; C08J2367/02
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |