US2548909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing lamellar polystyrene particles
Assignee: Dow Chemical Co
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Filing: 1948-02-09
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Granted: 1951-04-17
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Expires: 1968-02-09
Abstract
No abstract record available.
Inventors
- 👤 Laurence L Ryden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:40
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/16; C08J2325/00; C08J2325/02; C08J2325/04; Y; Y10; Y10S; Y10S425/00; Y10S425/101
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
92 words
A PROCESS FOR MAKING PIGMENTAL LAMINAE OF POLYSTYRENE FROM AN AQUEOUS COLLOIDAL POLYSTYRENE SOLUTION OBTAINED BY POLYMERIZING STYRENE IN AQUEOUS EMULSION WHICH COMPRIESE DISPERSING A PIGMENT IN SAID COLLOIDAL SOLUTION, APPLYING A LAYER OF THE AQUEOUS DISPERSION TO A METAL SURFACE, DRYING THE AQUEOUS LAYER BY HEATING THE SAME TO A TEMPERTURE BELOW THE FUSION TEMPERATURE OF THE POLYSTYRENE TO OBTAIN POWDERY FLAKES WHICH RETAIN THEIR IDENTITY, HEATING THE POWDERY FLAKES TO A TEMPERATURE SUFFICIENT TO FUSE THE POLYSTYRENE PARTICLES IN THE INDIVIDUAL POWDERY FLAKES AND FORM LAMELLAR PARTICLES, COOLING THE USED
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |