US3486864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for increasing the viscosity and degree of polymerization of ethylene terephthalate prepolymer
Assignee: Akzona Inc
•
Filing: 1966-05-09
•
Granted: 1969-12-30
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Expires: 1986-05-09
Abstract
No abstract record available.
Inventors
- 👤 Bernard L A Van Der Schee
- 👤 Bertus H Zandstra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:08
CPC Classifications
D; D01; D01D; D01D1/00; D01D1/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2615199A
Cited
US2964391A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |