US3772252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metod of preparing small particles of a solid polymer
Assignee: Hercules LLC
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Filing: 1972-05-17
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Granted: 1973-11-13
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Expires: 1992-05-17
Abstract
Abstract SMALL PARTICLES OF A NORMALLY SOLID POLYMER ARE PREPARED BY EMULSIFYING IN WATER A SOLUTION OF THE POLYMER AND ADDING TO THIS EMULSION A WATER IMMISICIBLE ORGANIC LIQUID WHICH IS MISCIBLE WITH THE POLYMER SOLVENT BUT WHICH IS ITSELF A NONSOLVENT FOR THE POLYMER. THE POLYMER SOLVENT IS THUS EXTRACTED OUT OF THE EMULSIFIED POLYMER SOLUTION DROPLET AND THE POLYMER IS LIBERATED AS A PARTICLE HAVING SUBSTANTIALLY THE SAME SPHERICAL SHAPE AS THE DROPLET. THE METHOD WORKS MOST EFFECTIVELY WITH NORMALLY SOLID THERMOPLASTIC POLYESTERS TO FORM SPHERICAL PARTICLES SUITABLE AS POWDER COATINGS.
Inventors
- 👤 H Blunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:27
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/16
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |