Patent US3208958A successfully refreshed from Google Patents.
US3208958A
Expired / Lapsed
US
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Method and apparatus for producing plastic foam
Assignee: Pacific Vegetable Oil Corp
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Filing: 1963-03-04
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Granted: 1965-09-28
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Expires: 1983-03-04
Abstract
No abstract record available.
Inventors
- 👤 Roger G Jennings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:45
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/74; B29B7/7404; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/44; B29B7/7409; B29B7/7414; B29B7/7419; B29B7/7423; Y; Y10; Y10S; Y10S261/00; Y10S261/26; Y10S521/00; Y10S521/917
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
50 words
A METHOD OF PRODUCING A HOMOGENEOUS PRE-EXPANDED PLASTIC FOAM, COMPRISING THE STEPS OF MIXING THE PLASTIC-FOAM-FORMING INGREDIENTS EXPANDING THE MIXED PLASTIC AT A PRESSURE ONLY SLIGHTLY ABOVE ATMOSPHERIC, AND THEN STRAINING THE EXPANDED PLASTIC DIRECTLY AFTER IT IS EXPANDED, SO AS TO BREAK UP OVERSIZE CELLS AND DESTROY VOIDS THEREIN.
References Cited (Backward Citations)
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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) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |