Patent US3248461A successfully refreshed from Google Patents.
US3248461A
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US
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Method for continuous production of foamed plastic objects
Assignee: Dow Chemical Co
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Filing: 1963-07-29
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Granted: 1966-04-26
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Expires: 1983-07-29
Abstract
No abstract record available.
Inventors
- 👤 Charles R Wiles
- 👤 Kenneth R Hilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:22
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/0088; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/44; B29C44/445; B29C44/58; B29C44/3415; B29C44/3426; B29L; B29L2031/00; B29L2031/712; B29L2031/7132
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
109 words
METHOD OF FORMING A PLURALITY OF FOAMED UNITARY THERMOPLASTIC RESINOUS OBJECTS COMPRISING PROVIDING A FIRST MOLD HAVING A DESIRED CONFIGRUATION PLACING WITHIN SAID DESIRED CONFIGURATION QUANTITY OF RESINOUS THERMOPLASTIC EXPANDABLE MATERIAL, PLACING ADJACENT SAID FIRST MOLD A SECOND MOLD, HAVING A DESIRED CONFIGURATION AND CONFINING SAID EXPANDABLE THERMOPLASTIC MATERIAL BY MEANS OF SAID FIRST AND SECOND MOLDS, ADDING EXPANDABLE THERMOPLASTIC MATERIAL TO THE CONFIGURATION OF SAID SECOND MOLD CONFINING THE MATERIAL THEREIN WITH A THIRD MOLD HAVING A DESIRED CONFIGURATION CONTINUALLY SEQUENTIALLY HEATING SAID MOLDS AND CONTENTS THEEOF TO A TEMPERATURE SUFFICIENT TO EXPAND THE PARTICULATE THERMOPLASTIC MATERIAL, SEQUENTIALLY COOLING SAID MOLDS AND REMOVING THE FOAMED THERMOPLASTIC OBJECT THEREFROM.
Claim 2
Dependent Claim
109 words
METHOD OF FORMING A PLURALITY OF FOAMED UNITARY THERMOPLASTIC RESINOUS OBJECTS COMPRISING PROVIDING A FIRST MOLD HAVING A DESIRED CONFIGRUATION PLACING WITHIN SAID DESIRED CONFIGURATION QUANTITY OF RESINOUS THERMOPLASTIC EXPANDABLE MATERIAL, PLACING ADJACENT SAID FIRST MOLD A SECOND MOLD, HAVING A DESIRED CONFIGURATION AND CONFINING SAID EXPANDABLE THERMOPLASTIC MATERIAL BY MEANS OF SAID FIRST AND SECOND MOLDS, ADDING EXPANDABLE THERMOPLASTIC MATERIAL TO THE CONFIGURATION OF SAID SECOND MOLD CONFINING THE MATERIAL THEREIN WITH A THIRD MOLD HAVING A DESIRED CONFIGURATION CONTINUALLY SEQUENTIALLY HEATING SAID MOLDS AND CONTENTS THEEOF TO A TEMPERATURE SUFFICIENT TO EXPAND THE PARTICULATE THERMOPLASTIC MATERIAL, SEQUENTIALLY COOLING SAID MOLDS AND REMOVING THE FOAMED THERMOPLASTIC OBJECT THEREFROM.
Claim 3
Dependent Claim
22 words
THE METHOD OF CLAIM 1, WHEREIN AN UNEXPANDED NON-POROUS PLASTIC CUP LINER IS POSITIONED BETWEEN SAID EXPANDABLE POLYSTYRENE AND THE ADJACENT MOLD.
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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) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |