US3862084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyethylene terephthalate containing inorganic fillers
Assignee: Akzona Inc
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Filing: 1971-07-09
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Granted: 1975-01-21
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Expires: 1991-07-09
Abstract
Abstract A process for the preparation of polyethylene terephthalate containing one or more inorganic fillers comprising heating chips of the amorphous polyethylene terephthalate to a temperature in the range between approximately 5*C. below and approximately 27*C. above the glass transition point (Tg) of the said polymer and mixing inorganic filler with the softened polymer.
Inventors
- 👤 Bertrus H Zandstra
- 👤 Jan Bosman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:29
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/203; C08L; C08L67/00; C08L67/02; C08J2367/00; C08J2367/02
Claims Analysis
Total Claims: 0
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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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |