US2839422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for lubricating polystyrene granules and enhanced molding granules thereby obtained
Assignee: Dow Chemical Co
•
Filing: 1956-02-17
•
Granted: 1958-06-17
•
Expires: 1976-02-17
Abstract
No abstract record available.
Inventors
- 👤 Carlton E Beyer
- 👤 Robert B Dahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:06
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/18; B; B29; B29B; B29B9/00; B29B9/16; B29B2009/163; C08J2325/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
104 words
METHOD FOR THE PREPARATION OF ENHANCED LUBRICATED POLYSTYRENE GRANULES FOR INJECTION MOLDING PURPOSES WHICH COMPRISES EXTRUDING POLYSTYRENE INTO A STAND, DIPPING SAID STRAND AT A TEMPERATURE BETWEEN ABOUT 250 AND 350* F. INTO AN AQUEOUS BATH AT A TEMPERATURE BETWEEN ABOUT 100 AND 160*F. IN WHICH THERE IS IMMISCIBLY PROVIDED BUTYL STEARATE IN A SUBSTANTIALLY NON-EMULSIFIED CONDITION, WITHDRAWING SAID STRAND FROM SAID BATH SO AS TO CONTAIN A SUPERFICIALLY DIFFUSED COATING OF SAID BUTYL STEARATE IN AN AMOUNT BETWEEN ABOUT 0.1 AND 1.0 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF THE STRAND, AND CUTTING SAID STRAND INTO GRANULES SUITABLE FOR INJECTION MOLDING PURPOSES.
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) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |