Patent DE569978C successfully refreshed from Google Patents.
Patent US3375309A successfully refreshed from Google Patents.
US3375309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of introducing particulate moldable material into a confined space
Assignee: Kohler General Inc
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Filing: 1964-06-17
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Granted: 1968-03-26
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Expires: 1984-06-17
Abstract
No abstract record available.
Inventors
- 👤 Donald E Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:50
CPC Classifications
B; B29; B29C; B29C31/00; B29C31/04; B29C31/041; B29C31/02; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/44; B29C44/445; B29C44/3415; B29C44/3426; B29K; B29K2105/00; B29K2105/04; B29K2105/048; B29K2105/25; B29K2105/251
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
203 words
A METHOD INTRODUCING PARTICULATE MOLDABLE MATERIAL INTO A CONFINED SPACE IN AN OTHERWISE SUBSTANTIALLY CLOSED MOLD FOR THE MOLDING OF A WORKPIECE, SAID METHOD COMPRISING THE STORAGE OF PARTICULATE MOLDING MATERIAL AT A POINT REMOTE FROM THE MOLD, THE TEMPORARY ESTABLISHMENT OF SUPERATMOSPHERIC PRESSURE ON THE MATERIAL IN STORAGE, THE TEMPORARY ESTABLISHMENT OF A CURRENT OF CONVECTION FLUID TOWARD THE MOLD, THE ENTRAINMENT OF PARTICULATE MATERIAL IN SAID CURRENT, THE MATERIAL RECEIVING KINETIC ENERGY FROM THE FLUID OF SAID CURRENT, THE KINETIC ENERGY OF THE ENTRAINED MATERIAL CARRYING IT INTO THE MOLD, DEVELOPING BACK PRESSURE OF CONVECTION FLUID IN THE MOLD AND THEREBY ARRESTING FURTHER FLOW OF SUCH FLUID WHILE THE KINETIC ENERGY OF THE ENTRAINED MATERIAL CARRIES SUCH MATERIAL ONWARD INTO THE MOLD, THE RETURN OF THE CONVECTION FLUID FROM THE MOLD UNDER THE BACK PRESSURE DEVELOPED BY SUCH MATERIAL IN THE MODL, A REVERSE CURRENT OF SAID FLUID MOVING INTO PARTICULATE MOLDING MATERIAL WHICH IS STILL IN STORAGE, ANY EXCESS OF MATERIAL AT THE MOLD BEING CARRIED AWAY FROM THE MOLD BY THE RETURN OF THE REVERSED CURRENT OF SAID FLUID, THE TRAPPING OF THE RETURNED MATERIAL IN THE MATERIAL IN STORAGE, AND THE SUBSEQUENT RELEASE OF THE RETURNED CONVECTION FLUID.
Claim 2
Independent Claim
203 words
A METHOD INTRODUCING PARTICULATE MOLDABLE MATERIAL INTO A CONFINED SPACE IN AN OTHERWISE SUBSTANTIALLY CLOSED MOLD FOR THE MOLDING OF A WORKPIECE, SAID METHOD COMPRISING THE STORAGE OF PARTICULATE MOLDING MATERIAL AT A POINT REMOTE FROM THE MOLD, THE TEMPORARY ESTABLISHMENT OF SUPERATMOSPHERIC PRESSURE ON THE MATERIAL IN STORAGE, THE TEMPORARY ESTABLISHMENT OF A CURRENT OF CONVECTION FLUID TOWARD THE MOLD, THE ENTRAINMENT OF PARTICULATE MATERIAL IN SAID CURRENT, THE MATERIAL RECEIVING KINETIC ENERGY FROM THE FLUID OF SAID CURRENT, THE KINETIC ENERGY OF THE ENTRAINED MATERIAL CARRYING IT INTO THE MOLD, DEVELOPING BACK PRESSURE OF CONVECTION FLUID IN THE MOLD AND THEREBY ARRESTING FURTHER FLOW OF SUCH FLUID WHILE THE KINETIC ENERGY OF THE ENTRAINED MATERIAL CARRIES SUCH MATERIAL ONWARD INTO THE MOLD, THE RETURN OF THE CONVECTION FLUID FROM THE MOLD UNDER THE BACK PRESSURE DEVELOPED BY SUCH MATERIAL IN THE MODL, A REVERSE CURRENT OF SAID FLUID MOVING INTO PARTICULATE MOLDING MATERIAL WHICH IS STILL IN STORAGE, ANY EXCESS OF MATERIAL AT THE MOLD BEING CARRIED AWAY FROM THE MOLD BY THE RETURN OF THE REVERSED CURRENT OF SAID FLUID, THE TRAPPING OF THE RETURNED MATERIAL IN THE MATERIAL IN STORAGE, AND THE SUBSEQUENT RELEASE OF THE RETURNED CONVECTION FLUID.
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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) | 1971-03-26 | 1971-09-25 | 1972-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-26 | 1975-09-25 | 1976-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-26 | 1979-09-25 | 1980-03-26 | $7700.00 | Window Closed / Lapsed |