US3248462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing foamed sheet material having essentially equal tensile properties
Assignee: Dow Chemical Co
•
Filing: 1962-10-22
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Granted: 1966-04-26
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Expires: 1982-10-22
Abstract
No abstract record available.
Inventors
- 👤 Elwyn E Merrill
- 👤 Stanley S Tabol
- 👤 Earl W Veazey
- 👤 William E Rittenhouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:31
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/141; B; B29; B29C; B29C44/00; B29C44/34; B29C44/3442; B29C44/36; B29C44/46; B29C44/50; B29C44/507; B29L; B29L2023/00; C08J2325/00; Y; Y10; Y10S; Y10S521/00; Y10S521/908
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A METHOD FOR PRODUCING AN EXTRUDED FOAMED STYRENE POLYMER FILM PRODUCT HAVING ESSENTIALLY EQUAL TENSILE PROPERTIES IN BIAXIAL DIRECTIONS COMPRISING EXTRUDING A FUSED STYRENE POLYMER THROUGH A GENERALLY CIRCULAR EXTRUSION ORIFICE IN A TUBE DIE IN THE FORM O A SEAMLESS TUBE, WITHDRAWING SAID FRESHLY EXTRUDED TUBE AWAY FROM SAID DIE AND IMMEDIATELY INCREASING THE DIAMETER OF SAID EX-
Claim 2
Independent Claim
59 words
A METHOD FOR PRODUCING AN EXTRUDED FOAMED STYRENE POLYMER FILM PRODUCT HAVING ESSENTIALLY EQUAL TENSILE PROPERTIES IN BIAXIAL DIRECTIONS COMPRISING EXTRUDING A FUSED STYRENE POLYMER THROUGH A GENERALLY CIRCULAR EXTRUSION ORIFICE IN A TUBE DIE IN THE FORM O A SEAMLESS TUBE, WITHDRAWING SAID FRESHLY EXTRUDED TUBE AWAY FROM SAID DIE AND IMMEDIATELY INCREASING THE DIAMETER OF SAID EX-
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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) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |