Patent US5154807A successfully refreshed from Google Patents.
Patent US3159694A successfully refreshed from Google Patents.
US3159694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous molding process
Assignee: Dow Chemical Co
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Filing: 1962-08-01
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Granted: 1964-12-01
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Expires: 1982-08-01
Abstract
No abstract record available.
Inventors
- 👤 Charles R Wiles
- 👤 David L Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:51
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/44; B29C44/445; B29C33/00; B29C33/30; B29C33/301; B29C44/3415; B29C44/3426; Y; Y10; Y10S; Y10S220/00; Y10S220/14; Y10S425/00; Y10S425/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
A METHOD FOR THE FABRICATION OF PARTICULATE EXPANDABLE THERMOPLASTIC RESINOUS MATERIAL INTO SHAPED ARTICLES COMPRISING CONFINING IN EACH OF A PLURALITY OF SEQUENTIAL CAVITIES A MASS OF EXPANDABLE THERMOPLASTIC RESINOUS MATERIAL, PROVIDING BETWEEN GENERALLY ADJACENT AND SEQUENTIALLY ARRANGED CAVITIES A ONE WAY COMMUNICATION PATH SUBJECTING EACH OF SAID CAVITIES IN ORDER TO THE FOLLOWING SEQUENTIAL OPERATIONS; (A) EXHAUSTING AT LEAST A PORTION OF THE GASES CONTAINED THEREIN; (B) PASSING A FLUID HEAT EXCHANGE MEDIUM THROUGH SAID MATERIAL CONTAINED IN SAID CAVITIES AND AT LEAST A PORTION OF THE FLUID HEAT EXCHANGE MEDIUM PASSED TO THE ADJACENT CAVITY BY MEANS OF THE ONE WAY COMMUNICATION PATH; (C) HEATING SAID MASSES TO A TEMPERATURE SUFFICIENT TO CAUSE SAID MASSES TO EXPAND AND KNIT TOGETHER TO FORM A UNITARY CELLULAR BODY; (D) WITHDRAWING SAID HEATING MEDIUM; (E) COOLING SAID MASSES TO A TEMPERATURE BELOW THE HEAT DISTORTION TEMPERATURE OF SAID EXPANDED MASSES WITH THE FURTHER LIMITATION THAT AT LEAST A PORTION OF THE HEAT EXCHANGE FLUID IS PASSED SEQUENTIALLY THROUGH AT LEAST TWO OF SAID MASSES.
Claim 2
Independent Claim
173 words
A METHOD FOR THE FABRICATION OF PARTICULATE EXPANDABLE THERMOPLASTIC RESINOUS MATERIAL INTO SHAPED ARTICLES COMPRISING CONFINING IN EACH OF A PLURALITY OF SEQUENTIAL CAVITIES A MASS OF EXPANDABLE THERMOPLASTIC RESINOUS MATERIAL, PROVIDING BETWEEN GENERALLY ADJACENT AND SEQUENTIALLY ARRANGED CAVITIES A ONE WAY COMMUNICATION PATH SUBJECTING EACH OF SAID CAVITIES IN ORDER TO THE FOLLOWING SEQUENTIAL OPERATIONS; (A) EXHAUSTING AT LEAST A PORTION OF THE GASES CONTAINED THEREIN; (B) PASSING A FLUID HEAT EXCHANGE MEDIUM THROUGH SAID MATERIAL CONTAINED IN SAID CAVITIES AND AT LEAST A PORTION OF THE FLUID HEAT EXCHANGE MEDIUM PASSED TO THE ADJACENT CAVITY BY MEANS OF THE ONE WAY COMMUNICATION PATH; (C) HEATING SAID MASSES TO A TEMPERATURE SUFFICIENT TO CAUSE SAID MASSES TO EXPAND AND KNIT TOGETHER TO FORM A UNITARY CELLULAR BODY; (D) WITHDRAWING SAID HEATING MEDIUM; (E) COOLING SAID MASSES TO A TEMPERATURE BELOW THE HEAT DISTORTION TEMPERATURE OF SAID EXPANDED MASSES WITH THE FURTHER LIMITATION THAT AT LEAST A PORTION OF THE HEAT EXCHANGE FLUID IS PASSED SEQUENTIALLY THROUGH AT LEAST TWO OF SAID MASSES.
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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) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |