Patent US3259609A successfully refreshed from Google Patents.
US3259609A
Expired / Lapsed
US
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Preparation of powdered resins
Assignee: FURUKAWA CHEMICAL IND Co
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Filing: 1961-08-08
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Granted: 1966-07-05
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Expires: 1981-08-08
Abstract
No abstract record available.
Inventors
- 👤 Satake Shozo
- 👤 Tatebayashi Kenji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:10
CPC Classifications
B; B29; B29B; B29B13/00; B29B13/10; B29B9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
PROCESS FOR PREPARING FINELY DIVIDED POWDERS OF NORMALLY SOLIDS POLYMERS VINYL OLEFINS HAVING FROM 2 TO 8 CARBON ATOMS IN THE MOLECULE WHICH COMPRISES CONTACTING SAID NORMALLY SOLID POLYMER WITH AN INERT SOLVENT, CHARACTERIZED BY HAVING A SOLVATING ACTION ON SAID POLYMER, TO FORM A SOLID POLYMER-RICH PHASE SWOLLEN WITH SOLVENT, TREATING SAID SOLID POLYMER RICH PHASE WITH STEAM TO REMOVE IMBIBED SOLVENT AND TO OBTAIN A POROUS POLYMER PHASE CONTANING UP TO ABOUT 25% BY WEIGHT OF WATER IMBIBED IN THE PORES THEREOF, AND GRINDING SAID WET POROUS POLYMER PHASE AT A TEMPERATURE BELOW THE SOFTENING POINT OF SAID RESIN TO PRODUCE A FINELY DIVIDED POWDER OF SAID POLYMER.
Claim 2
Dependent Claim
110 words
PROCESS FOR PREPARING FINELY DIVIDED POWDERS OF NORMALLY SOLIDS POLYMERS VINYL OLEFINS HAVING FROM 2 TO 8 CARBON ATOMS IN THE MOLECULE WHICH COMPRISES CONTACTING SAID NORMALLY SOLID POLYMER WITH AN INERT SOLVENT, CHARACTERIZED BY HAVING A SOLVATING ACTION ON SAID POLYMER, TO FORM A SOLID POLYMER-RICH PHASE SWOLLEN WITH SOLVENT, TREATING SAID SOLID POLYMER RICH PHASE WITH STEAM TO REMOVE IMBIBED SOLVENT AND TO OBTAIN A POROUS POLYMER PHASE CONTANING UP TO ABOUT 25% BY WEIGHT OF WATER IMBIBED IN THE PORES THEREOF, AND GRINDING SAID WET POROUS POLYMER PHASE AT A TEMPERATURE BELOW THE SOFTENING POINT OF SAID RESIN TO PRODUCE A FINELY DIVIDED POWDER OF SAID POLYMER.
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) | 1969-07-04 | 1970-01-03 | 1970-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-04 | 1974-01-03 | 1974-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-04 | 1978-01-03 | 1978-07-05 | $7700.00 | Window Closed / Lapsed |