Patent US2172173A successfully refreshed from Google Patents.
US3663674A
Expired / Lapsed
US
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Densification of poly-alpha-olefins
Assignee: Gulf Research and Development Co
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Filing: 1969-07-01
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Granted: 1972-05-16
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Expires: 1989-07-01
Abstract
Abstract POLY-A-OLEFINS ARE PAREPARED IN A DENSE GRANULAR FORM SUITABLE FOR MOLDING OR EXTRUSION BY THE APPLICATION OF SUFFICIENT MECHANICAL ENERGY TO COMPRESS AND COLLAPSE THE POROUS POLYMER PARTICLES RECOVERED FROM THE POLYMERIZATION REACTOR.
Inventors
- 👤 Allan D Holiday
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:10
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/461; B01; B01J; B01J2/00; B01J2/22; B29B; B29B9/00
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |