Patent US2980539A successfully refreshed from Google Patents.
US2980539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing and molding plastic materials having a gaseous ingredient
Assignee: Chemetron Corp
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Filing: 1958-06-23
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Granted: 1961-04-18
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Expires: 1978-06-23
Abstract
No abstract record available.
Inventors
- 👤 Henry W Bevarly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:48
CPC Classifications
A; A23; A23D; A23D7/00; A23D7/02; A23D9/00; A23D9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A METHOD FOR PREPARING PLASTIC MATERIAL HAVING A GASEOUS INGREDIENT AND FORMING THEREFROM ACCURATELY SIZED PRINTS OF UNIFORM WEIGHT COMPRISING, MIXING UNDER A CONTROLLED ELEVATED PRESSURE AN AREATED MIXTURE OF MATERIAL INGREDIENTS INCLUDING A VOLUME OF GAS COMMENSURATE WITH A PREDETERMINED SPECIFIC GRAVITY OF THE FINAL PRINT AT ATMOSPHERIC PRESSURE, FLOWING A PORTION OF SAID AERATED MIXTURE UNDER AN ELEVATED PRESSURE INTO A MOLDING APPARATUS AND PERMITTING SAID PORTION TO UNDERGO A FIRST EXPANSION AND TO REACH AN INTERMEDIATE AND LOWER PRESSURE PRIOR TO SEGREGATION OF SAID PORTION FROM THE REMAINDER OF SAID MIXTURE, AND SEGREGATING SAID PORTION AND PERMITTING SAID SEGREGATED PORTION TO UNDERGO A SECOND EXPANSION AND TO REACH SUBSTANTIALLY ATMOSPHERIC
Claim 2
Independent Claim
113 words
A METHOD FOR PREPARING PLASTIC MATERIAL HAVING A GASEOUS INGREDIENT AND FORMING THEREFROM ACCURATELY SIZED PRINTS OF UNIFORM WEIGHT COMPRISING, MIXING UNDER A CONTROLLED ELEVATED PRESSURE AN AREATED MIXTURE OF MATERIAL INGREDIENTS INCLUDING A VOLUME OF GAS COMMENSURATE WITH A PREDETERMINED SPECIFIC GRAVITY OF THE FINAL PRINT AT ATMOSPHERIC PRESSURE, FLOWING A PORTION OF SAID AERATED MIXTURE UNDER AN ELEVATED PRESSURE INTO A MOLDING APPARATUS AND PERMITTING SAID PORTION TO UNDERGO A FIRST EXPANSION AND TO REACH AN INTERMEDIATE AND LOWER PRESSURE PRIOR TO SEGREGATION OF SAID PORTION FROM THE REMAINDER OF SAID MIXTURE, AND SEGREGATING SAID PORTION AND PERMITTING SAID SEGREGATED PORTION TO UNDERGO A SECOND EXPANSION AND TO REACH SUBSTANTIALLY ATMOSPHERIC
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) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |