Patent US3331899A successfully refreshed from Google Patents.
US3331899A
Expired / Lapsed
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Process and apparatus for making shaped cellular articles from expandable thermoplastic resins
Assignee: Atlantic Richfield Co
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Filing: 1964-11-30
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Granted: 1967-07-18
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Expires: 1984-11-30
Abstract
No abstract record available.
Inventors
- 👤 Richard H Immel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:22
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; B; B29; B29C; B29C44/00; B29C44/34; B29C44/3403; B29C44/3415; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/08; Y; Y10; Y10S; Y10S521/00; Y10S521/915
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A METHOD OF FORMING A SHAPED FOAMED CELLULAR THERMOPLASTIC ARTICLE COMPRISING FEEDING GRANULES OF AN EXPANDABLE THERMOPLASTIC MATERIAL CONTAINING AN ADDITIVE TO IMPART A HIGH POWER LOSS FACTOR AT A TEMPERATURE BELOW THE SOFTENING POINT OF SAID THERMOPLASTIC MATERIAL TO A CHAMBER THAT DEFINES THE SHAPE OF THE FOAMED ARTICLE. SUBJECTING SAID GRANULES IN SAID CHAMBER TO HIGH FREQUENCY ELECTRICAL ENERGY TO HEAT SAID GRANULES TO A TEMPERATURE FROM 5 TO 10*F. ABOVE THE SOFTENING POINT OF SAID THERMOPLASTIC MATERIAL. SUBJECTING SAID HEATED GRANULES IN SAID CHAMBER TO A VACUUM OF 15-30 INCHES OF MERCURY SO THAT SAID GRANULES EXPAND AND FUSE TOGETHER TO FORM A SHAPED CELLULAR FORAMED THERMOPLASTIC ARTICLE CONFORMING TO SAID CHAMBER, AND THEREAFTER REMOVING SAID SHAPED CELLULAR THERMOPLASTIC ARTICLE FROM SAID CHAMBER.
Claim 2
Independent Claim
126 words
A METHOD OF FORMING A SHAPED FOAMED CELLULAR THERMOPLASTIC ARTICLE COMPRISING FEEDING GRANULES OF AN EXPANDABLE THERMOPLASTIC MATERIAL CONTAINING AN ADDITIVE TO IMPART A HIGH POWER LOSS FACTOR AT A TEMPERATURE BELOW THE SOFTENING POINT OF SAID THERMOPLASTIC MATERIAL TO A CHAMBER THAT DEFINES THE SHAPE OF THE FOAMED ARTICLE. SUBJECTING SAID GRANULES IN SAID CHAMBER TO HIGH FREQUENCY ELECTRICAL ENERGY TO HEAT SAID GRANULES TO A TEMPERATURE FROM 5 TO 10*F. ABOVE THE SOFTENING POINT OF SAID THERMOPLASTIC MATERIAL. SUBJECTING SAID HEATED GRANULES IN SAID CHAMBER TO A VACUUM OF 15-30 INCHES OF MERCURY SO THAT SAID GRANULES EXPAND AND FUSE TOGETHER TO FORM A SHAPED CELLULAR FORAMED THERMOPLASTIC ARTICLE CONFORMING TO SAID CHAMBER, AND THEREAFTER REMOVING SAID SHAPED CELLULAR THERMOPLASTIC ARTICLE FROM SAID CHAMBER.
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) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |