US3770668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Styrene polymer foam and the preparation thereof
Assignee: Dow Chemical Co
•
Filing: 1970-10-29
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Granted: 1973-11-06
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Expires: 1990-10-29
Abstract
Abstract STABLE, LOW DENSITY, SMALL CELL SIZE STYRENE POLYMER FOAM IS EXTRUDED IN LARGE SECTIONS EMPLOYING A CAREFULLY SELECTED BLOWING AGENT AND AN INTIMATE DISPERSION OF THE BLOWING AGENT WITH THE STYRENE POLYMER WHILE IN HEAT PLASTIFIED FORM.
Inventors
- 👤 John Marvin Corbett
- 👤 Marlin Germain Bussey
- 👤 Graydon Wayne Killingbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:53
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08J2325/00; Y; Y10; Y10S; Y10S521/00; Y10S521/91
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |