Patent EP0217689A1 successfully refreshed from Google Patents.
US2954589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of molding expanded resins
Assignee: Kent Plastics Corp
•
Filing: 1956-03-19
•
Granted: 1960-10-04
•
Expires: 1976-03-19
Abstract
No abstract record available.
Inventors
- 👤 Winthrop L Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:02
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/44; B29C44/445; B29C44/3415; B29C44/3426; B29L; B29L2031/00; B29L2031/712; B29L2031/7132; Y; Y10; Y10S; Y10S220/00; Y10S220/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A METHOD FOR PREPARING A MOLDED CELLULAR ARTICLE FROM POLYSTYRENE RESIN WHICH COMPRISES PROVIDING A MOLD HAVING A CAVITY OF ARTICLE SHAPE WITH VERTICALLY DISPOSED SIDE WALLS, APPLYING A COMBINATION ADHESIVE AND MOLD RELEASE AGENT TAKEN FROM THE GROUP CONSISTING OF LIQUID SOAPS, LIQUID NON-SOAP DETERGENTS AND GLYCERIN OVER AT LEAST A PART OF THE SURFACE OF THE MOLD CAVITY INCLUDING SAID SIDE WALLS, DEPOSITING POLYSTYRENE RESINOUS GRANULES ON THE ADHESIVE TO FORM A LAYER ON SAID CAVITY SURFACE, FILLING SAID CAVITY ADJACENT SAID LAYER WITH HEAT-EXPANDABLE, PARTIALLY EXPANDED POLYSTYRENE BEADS, HEATING THE MOLD TO COMPLETE EXPANSION OF THE BEADS AND SIMULTANEOUSLY FUSE THE RESIN GRANULES INTO A RELATIVELY DENSE SHELL INTEGRAL WITH SAID EXPANDED BEADS, COOLING THE MOLD TO BELOW THE HEAT DISTORTION TEMPERATURE OF THE MOLDED ARTICLE, AND REMOVING THE ARTICLE FROM THE MOLD.
Claim 2
Independent Claim
136 words
A METHOD FOR PREPARING A MOLDED CELLULAR ARTICLE FROM POLYSTYRENE RESIN WHICH COMPRISES PROVIDING A MOLD HAVING A CAVITY OF ARTICLE SHAPE WITH VERTICALLY DISPOSED SIDE WALLS, APPLYING A COMBINATION ADHESIVE AND MOLD RELEASE AGENT TAKEN FROM THE GROUP CONSISTING OF LIQUID SOAPS, LIQUID NON-SOAP DETERGENTS AND GLYCERIN OVER AT LEAST A PART OF THE SURFACE OF THE MOLD CAVITY INCLUDING SAID SIDE WALLS, DEPOSITING POLYSTYRENE RESINOUS GRANULES ON THE ADHESIVE TO FORM A LAYER ON SAID CAVITY SURFACE, FILLING SAID CAVITY ADJACENT SAID LAYER WITH HEAT-EXPANDABLE, PARTIALLY EXPANDED POLYSTYRENE BEADS, HEATING THE MOLD TO COMPLETE EXPANSION OF THE BEADS AND SIMULTANEOUSLY FUSE THE RESIN GRANULES INTO A RELATIVELY DENSE SHELL INTEGRAL WITH SAID EXPANDED BEADS, COOLING THE MOLD TO BELOW THE HEAT DISTORTION TEMPERATURE OF THE MOLDED ARTICLE, AND REMOVING THE ARTICLE FROM THE MOLD.
References Cited (Backward Citations)
US1435526A
Cited
US1862740A
Cited
US2394327A
Cited
US2454910A
Cited
US2604664A
Cited
US2744291A
Cited
US2787809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-04 | 1964-04-04 | 1964-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-04 | 1968-04-04 | 1968-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-04 | 1972-04-04 | 1972-10-04 | $7700.00 | Window Closed / Lapsed |