Patent JPS5915641A successfully refreshed from Google Patents.
US3554994A
Expired / Lapsed
US
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Process for altering the particle size distribution of alpha monoolefin polymers
Assignee: Standard Oil Co
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Filing: 1967-04-03
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Granted: 1971-01-12
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Expires: 1987-04-03
Abstract
Abstract A PROCESS FOR REARRANGING THE PARTICLE SIZE DISTRIBUTION OF FINELY DIVIDED SOLID ALPHA MONOOLEFIN POLYMERS COMPRISING HEATING A SLURRY OF POLYMER WET CAKE AND WATER TO A TEMPERATURE IN THE RANGE OF 35*-150* C. IN A CLOSED AUTOCLAVE FOR THE TIME NECESSARY TO PRECONDITION THE POLYMER AND THEREAFTER SHOCK COOLING THE HEATED SLURRY TO PROVIDE A POLYMER POWDER HAVING A CHANGED PARTICLE SIZE DISTRIBUTION IN THE RANGE OF 70 TO 250 MICRONS.
Inventors
- 👤 Richard P Maloney
- 👤 Habet M Khelghatian
- 👤 James F Dempsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:55
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08F; C08F6/00; C08F6/14; C08F6/18; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/08; Y; Y10; Y10S; Y10S526/00; Y10S526/909
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |