US3586654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of polymer powders of controlled particle shape,size and size distribution and product
Assignee: Millennium Petrochemicals Inc
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Filing: 1969-04-15
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Granted: 1971-06-22
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Expires: 1989-04-15
Abstract
Abstract POLYMER POWDERS ARE PREPARED BY CONTROLLED MELTING, HEATING AND AGITATION OF A LIQUID DISPERSION OF POLYMER PARTICLES IN THE PRESENCE OF A SURFACTANT. POWDERS CAN THUS BE OBTAINED COMPOSED OF SPERICAL PARTICLES OF CONTROLLED AVERAGE SIZE AND SIZE DISTRIBUTION, THE SAME, LARGER OR SMALLER THAN THE STARTING PARTICLES. PARTICLES CAN ALSO BE PRODUCED FROM MOLTEN POLYMER MASSES, IN A LIQUID WITH ADDED SURFACTANT AND THEN MODIFIED IN SHAPE, SIZE AND SIZE DISTRIBUTION BY ADDITIONAL CONTROLLED HEATING AND AGITATION OF THE LIQUID DISPERSION.
Inventors
- 👤 Frank Lerman
- 👤 Raymond C Bartsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:23
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/228; C08J3/00; C08J3/12; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; Y; Y10; Y10S; Y10S524/00; Y10S524/908
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |