US3040384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making hollow plastic articles
Assignee: Sun Rubber Co
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Filing: 1960-03-10
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Granted: 1962-06-26
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Expires: 1980-03-10
Abstract
No abstract record available.
Inventors
- 👤 Lloyd R Whittington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:30
CPC Classifications
B; B29; B29D; B29D22/00; B29D22/04; B29C; B29C33/00; B29C33/12; B29C41/00; B29C41/02; B29C41/20; B29C41/34; B29C41/46; B29C70/00; B29C70/68; B29C41/04; B29K; B29K2027/00; B29K2027/06; B29K2105/00; B29K2105/0058; B29K2105/0061; B29L; B29L2031/00; B29L2031/54; Y; Y10; Y10S; Y10S264/00; Y10S264/60; Y10S264/65; Y10S273/00; Y10S273/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
190 words
THE PROCESS OF MAKING RELATIVELY THICK-WALLED HOLLOW ARTICLES FROM A LIQUID MIXTURE TO A VINYL RESIN AND A PLASTICIZER THEREFOR, IN WHICH A MEASURED CHARGE OF SAID MIXTURE IS DEPOSITED IN A HOLLOW SECTIONAL MOLD, SAID MOLD HAVING SUBSTANTIAL CAPACITY FOR STORING HEAT ENERGY AND ARTICLE FORMING CAVITY SURFACE PORTIONS, AND SAID MOLD IS CLOSED WITH SAID DEPOSITED CHARGE THEREIN, AND SAID CLOSED MOLD IS ROTATED IN A MULTIPLICITY OF PLANES TO DISTRIBUTE THE CHARGE AS A LAYER OVER THE CAVITY SURFACE PORTIONS, COMPRISING THE STEPS OF, EXPOSING SAID ROTATING MOLD TO A SOURCE OF HEAT ENERGY FOR A PERIOD OF TIME SUFFICIENT TO GEL SAID LAYER BUT INSUFFICIENT TO FUSE THE GELLED LAYER, WITHDRAWING SAID MOLD FROM FURTHER EXPOSURE TO SAID SOURCE OF HEAT ENERGY TO DIMINISH THE TEMPERATURE GRADIENT BETWEEN THE MOLD AND THE INNER SURFACE OF THE GELLED LAYER THEREBY EQUALIZING THE TEMPERATURE GRADIENT WITHIN THE LAYER, WHEREBY THE RESULTANT TRANSFER OF HEAT ENERGY FROM THE MOLD TO THE LAYER WILL ELEVATE THE TEMPERATURE WITHIN THE LAYER SUFFICIENTLY TO FUSE THE SAME, AND COOLING THE MOLD AND OPENING THE SAME FOR REMOVAL OF THE FUSED ARTICLE THEREFROM.
Claim 2
Dependent Claim
190 words
THE PROCESS OF MAKING RELATIVELY THICK-WALLED HOLLOW ARTICLES FROM A LIQUID MIXTURE TO A VINYL RESIN AND A PLASTICIZER THEREFOR, IN WHICH A MEASURED CHARGE OF SAID MIXTURE IS DEPOSITED IN A HOLLOW SECTIONAL MOLD, SAID MOLD HAVING SUBSTANTIAL CAPACITY FOR STORING HEAT ENERGY AND ARTICLE FORMING CAVITY SURFACE PORTIONS, AND SAID MOLD IS CLOSED WITH SAID DEPOSITED CHARGE THEREIN, AND SAID CLOSED MOLD IS ROTATED IN A MULTIPLICITY OF PLANES TO DISTRIBUTE THE CHARGE AS A LAYER OVER THE CAVITY SURFACE PORTIONS, COMPRISING THE STEPS OF, EXPOSING SAID ROTATING MOLD TO A SOURCE OF HEAT ENERGY FOR A PERIOD OF TIME SUFFICIENT TO GEL SAID LAYER BUT INSUFFICIENT TO FUSE THE GELLED LAYER, WITHDRAWING SAID MOLD FROM FURTHER EXPOSURE TO SAID SOURCE OF HEAT ENERGY TO DIMINISH THE TEMPERATURE GRADIENT BETWEEN THE MOLD AND THE INNER SURFACE OF THE GELLED LAYER THEREBY EQUALIZING THE TEMPERATURE GRADIENT WITHIN THE LAYER, WHEREBY THE RESULTANT TRANSFER OF HEAT ENERGY FROM THE MOLD TO THE LAYER WILL ELEVATE THE TEMPERATURE WITHIN THE LAYER SUFFICIENTLY TO FUSE THE SAME, AND COOLING THE MOLD AND OPENING THE SAME FOR REMOVAL OF THE FUSED ARTICLE THEREFROM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-25 | 1965-12-25 | 1966-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-25 | 1969-12-25 | 1970-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-25 | 1973-12-25 | 1974-06-26 | $7700.00 | Window Closed / Lapsed |