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US3159693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming plastic articles
Assignee: OI Glass Inc
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Filing: 1961-12-01
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Granted: 1964-12-01
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Expires: 1981-12-01
Abstract
No abstract record available.
Inventors
- 👤 Charles E Plymale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:20
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/10; B29C51/00; Y; Y10; Y10S; Y10S220/00; Y10S220/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
221 words
A METHOD OF FORMING A PLASTIC ARTICLE FROM A SHEET OF EXPANDABLE PLASTIC CONTAINING A FOAMING AGENT WHICH COMPRISES; (1) ENGAGING THE TWO MAJOR SURFACES OF THE SHEET AT THE PERIPHERY OF A PORTION OF THE SHEET BY CAVITYCONFINING MOLD MEMBERS SO THAT EACH MAJOR SURFACE WITH THAT PERIPHERY FACES A CAVITY; (2) INTRODUCING A FLUID INTO EACH CAVITY TO PROVIDE EQUAL PRESSURES AGAINST BOTH SURFACES WITHIN THT PERIPHERY GREATER THAN THE PRESSURE TO BE IMPARTED BY THE FOAMING AGENT AT A SUBSEQUENT FORMING TEMPERATURE; (3) HEATING THE SHEET WITHIN THE PERPHERY OF THAT PORTION TO A FORMING TEMPERATURE WHILE MAINTAINING FLUID PRESSURES AGAINST BOTH SURFACES GREATER THAN THAT OF THE FORMING AGENT; (4) FORMING THE HEATED SHEET WITHIN SIAD PERIPHERY WHILE MAINTAINING DIFFERENT SUPERATMOSPHERIC FLUID PRESSURES AGAINST BOTH SURFACES ABOVE THAT OF THE FOAMING AGENT UNTIL ONE MAJOR SURFACE ABUTS A CONCAVE MOLD SURFACE OF ONE OF THE MOLD MEMBERS TO FORM A SHAPED ARTICLE; (5) REDUCING THE FLUID PRESSURES ON THE MAJOR SURFACES TO A PRESSURE LESS THAN THAT PROVIDED BY THE FOAMING AGENT AT THE FORMING TEMPERATURE WHILE MAINTAINING THE ONE MAJOR SURFACE OF THE SHAPED ARTICLE IN CONTACT WITH THE MOLD SURFACE; AND (6) REDUCING THE FLUID PRESSURE ON THE MAJOR SURFACES TO THAT OF THE ATMOSPHERE WITH THE SHAPED ARTICLE IN CONTACT WITH THE MOLD SURFACE.
Claim 2
Independent Claim
221 words
A METHOD OF FORMING A PLASTIC ARTICLE FROM A SHEET OF EXPANDABLE PLASTIC CONTAINING A FOAMING AGENT WHICH COMPRISES; (1) ENGAGING THE TWO MAJOR SURFACES OF THE SHEET AT THE PERIPHERY OF A PORTION OF THE SHEET BY CAVITYCONFINING MOLD MEMBERS SO THAT EACH MAJOR SURFACE WITH THAT PERIPHERY FACES A CAVITY; (2) INTRODUCING A FLUID INTO EACH CAVITY TO PROVIDE EQUAL PRESSURES AGAINST BOTH SURFACES WITHIN THT PERIPHERY GREATER THAN THE PRESSURE TO BE IMPARTED BY THE FOAMING AGENT AT A SUBSEQUENT FORMING TEMPERATURE; (3) HEATING THE SHEET WITHIN THE PERPHERY OF THAT PORTION TO A FORMING TEMPERATURE WHILE MAINTAINING FLUID PRESSURES AGAINST BOTH SURFACES GREATER THAN THAT OF THE FORMING AGENT; (4) FORMING THE HEATED SHEET WITHIN SIAD PERIPHERY WHILE MAINTAINING DIFFERENT SUPERATMOSPHERIC FLUID PRESSURES AGAINST BOTH SURFACES ABOVE THAT OF THE FOAMING AGENT UNTIL ONE MAJOR SURFACE ABUTS A CONCAVE MOLD SURFACE OF ONE OF THE MOLD MEMBERS TO FORM A SHAPED ARTICLE; (5) REDUCING THE FLUID PRESSURES ON THE MAJOR SURFACES TO A PRESSURE LESS THAN THAT PROVIDED BY THE FOAMING AGENT AT THE FORMING TEMPERATURE WHILE MAINTAINING THE ONE MAJOR SURFACE OF THE SHAPED ARTICLE IN CONTACT WITH THE MOLD SURFACE; AND (6) REDUCING THE FLUID PRESSURE ON THE MAJOR SURFACES TO THAT OF THE ATMOSPHERE WITH THE SHAPED ARTICLE IN CONTACT WITH THE MOLD SURFACE.
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) | 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 |