US3159698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making and forming plastic material
Assignee: Sweetheart Plastics Inc
•
Filing: 1960-12-01
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Granted: 1964-12-01
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Expires: 1980-12-01
Abstract
No abstract record available.
Inventors
- 👤 Nam P Suh
- 👤 David F Stewart
- 👤 Ralph M Lamade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:08
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/14; B29C31/00; B29C31/004; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/507; B29C44/56; B29C44/5627; B29C44/5636; B32; B32B; B32B27/00; B29L; B29L2023/00; Y; Y10; Y10S; Y10S220/00; Y10S220/14; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1043; Y10T156/1044; Y10T156/1048
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A METHOD OF MAKING A CONTAINER COMPRISING THE STEPS OF EXTRUDING A TUBE OF POLYSTYRENE FOAM AT A TEMPERATURE BETWEEN 300* AND 320*F., PASSING THE TUBE BETWEEN PRESSURE ROLLERS BEFORE THE FOAM SETS TO COLLAPSE THE TUBE AND FORM A THIN FOAM SHEET, PROVIDING A SHEET OF POLYSTYRENE FILM, HEATING THE FILM TO CONDITION IT FOR BONDING TO THE FOAM AND HEATNG THE SURFACE OF THE FOAM SHEET TO MAINTAIN ITS TEMPERATURE BETWEEN 300* AND 320* F., THEREAFTER MECHANICALLY BONDING THE FILM AND THE SHEET TOGETHER TO FORM A LAMINATE, AND MATCH MOLDING THE LAMINATE INTO A CONTAINER BEFORE THE FOAM COOLS.
Claim 2
Independent Claim
102 words
A METHOD OF MAKING A CONTAINER COMPRISING THE STEPS OF EXTRUDING A TUBE OF POLYSTYRENE FOAM AT A TEMPERATURE BETWEEN 300* AND 320*F., PASSING THE TUBE BETWEEN PRESSURE ROLLERS BEFORE THE FOAM SETS TO COLLAPSE THE TUBE AND FORM A THIN FOAM SHEET, PROVIDING A SHEET OF POLYSTYRENE FILM, HEATING THE FILM TO CONDITION IT FOR BONDING TO THE FOAM AND HEATNG THE SURFACE OF THE FOAM SHEET TO MAINTAIN ITS TEMPERATURE BETWEEN 300* AND 320* F., THEREAFTER MECHANICALLY BONDING THE FILM AND THE SHEET TOGETHER TO FORM A LAMINATE, AND MATCH MOLDING THE LAMINATE INTO A CONTAINER BEFORE THE FOAM COOLS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |