US3553187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous process for producing powder polyethylene
Assignee: Japan Atomic Energy Agency
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Filing: 1967-12-04
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Granted: 1971-01-05
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Expires: 1987-12-04
Abstract
Abstract THIS INVENTION IS BASED IN THE FINDING THAT AN AQUEOUS SOLUTION (HAVING A SURFACE TENSION OF 32.5 DYNE/CM. OR LESS) OF AN ALKANOL HAVING 1-4 CARBON ATOMS IS SUITABLE AS A CARRIER OR DISPERSION MEDIUM FOR CONTINUOUSLY SEPARATING POWDER POLYETHYLENE WHICH IS PRODUCED BY POLYMERIZING ETHYLENE AT A TEMPERATURE LOWER THAN THE MELTING POINT OF THE PRODUCED POLYETHYLENE FROM THE REACTION VESSEL IN THE FORM OF A SLURRY IN WHICH THE POWDER POLYETHYLENE IS DISPERSED.
Inventors
- 👤 Masaaki Takehisa
- 👤 Tadao Yamada
- 👤 Yoshio Takasaka
- 👤 Kazukiyo Miyanaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:46
CPC Classifications
C; C08; C08F; C08F10/00
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |