US3671168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low heat capacity mold for injection molding
Assignee: Bischoff Chemical Corp
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Filing: 1971-06-09
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Granted: 1972-06-20
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Expires: 1991-06-09
Abstract
Abstract THIN WALLED MOLDS HAVING A THICKNESS WITHIN A RANGE FROM ABOUT 0.4 MM. TO ABOUT 4 MM. AND HAVING A HEAT CAPACITY LESS THAN THE HEAT CAPACITY OF THE MOLDED ARTICLE ARE PROVIDED IN APPARATUS FOR INJECTION MOLDING OF PLASTIC FOAM. IN CERTAIN EMBODIMENTS, HEAT TRANSFER FLUID IS CIRCULATED IN A ZONE ADJACENT THE THIN WALLED MOLD FACE. IN SOME EMBODIMENTS OF THE INVENTION, AN OUTER SHELL CAN PROVIDE SUPPLEMENT STRUCTURAL STRENGTH, WHILE BEING INSULATED BY CLOSED PORE INSULATION FROM THE TEMPERATURE CHANGES AND HEAT CAPACITY FEATURES OF THE MOLD FACE.
Inventors
- 👤 Frank J Nussbaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:36
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/3415; B29C44/3419; B29C33/00; B29C33/02; B29C33/04; B29C33/56; B29C35/00; B29C35/007; B29C44/02; B29C44/04; B29C44/0407; B29C33/046; B29K; B29K2105/00; B29K2105/04; Y; Y10; Y10S; Y10S264/00; Y10S264/83
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |