US3236927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of molding foamable plastic materials
Assignee: WMF Container Corp
•
Filing: 1964-08-18
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Granted: 1966-02-22
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Expires: 1984-08-18
Abstract
No abstract record available.
Inventors
- 👤 Stanley W Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:01
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/44; B29C44/445; B29C44/3415; B29C44/3426
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A METHOD OF MOLDING A FOAMABLE PLASTIC MATERIAL, CHARACTERIZED BY THE USE OF A MOLD HAVING WALL MEANS DEFINING A MOLD CAVITY, AND INCLUDING THE STEPS OF: (A) INTRODUCING THE FOAMABLE PLACTIC MATERIAL INTO SAID MOLD CAVITY; (B) APPLYING STEAM EXTERNALLY TO SAID WALL MEANS WHILE EXCLUDING SUCH STEAM FROM SAID MOLD CAVITY TO PREHEAT SAID WALL MEANS AND THE FOAMABLE PLASTIC MATERIAL WITHIN SAID MOLD CAVITY; AND (C) SUBSEQUENT TO THE STEPS OF SUBPARAGRAPHS (A) AND (B) ADMITTING STEAM, WHICH HAS PREVIOUSLY BEEN IN CONTACT WITH THE OUTER SIDE OF SAID WALL MEANS, INTO SAID MOLD CAVITY TO FURTHER HEAT THE FOAMABLE PLASTIC MATERIAL.
Claim 2
Independent Claim
105 words
A METHOD OF MOLDING A FOAMABLE PLASTIC MATERIAL, CHARACTERIZED BY THE USE OF A MOLD HAVING WALL MEANS DEFINING A MOLD CAVITY, AND INCLUDING THE STEPS OF: (A) INTRODUCING THE FOAMABLE PLACTIC MATERIAL INTO SAID MOLD CAVITY; (B) APPLYING STEAM EXTERNALLY TO SAID WALL MEANS WHILE EXCLUDING SUCH STEAM FROM SAID MOLD CAVITY TO PREHEAT SAID WALL MEANS AND THE FOAMABLE PLASTIC MATERIAL WITHIN SAID MOLD CAVITY; AND (C) SUBSEQUENT TO THE STEPS OF SUBPARAGRAPHS (A) AND (B) ADMITTING STEAM, WHICH HAS PREVIOUSLY BEEN IN CONTACT WITH THE OUTER SIDE OF SAID WALL MEANS, INTO SAID MOLD CAVITY TO FURTHER HEAT THE FOAMABLE PLASTIC MATERIAL.
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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) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |