Patent US3554932A successfully refreshed from Google Patents.
US3554932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of foamed thermoplastic
Assignee: Shell USA Inc
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Filing: 1967-03-28
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Granted: 1971-01-12
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Expires: 1987-03-28
Abstract
Abstract FINELY DIVIDED PARTICLES HAVING FLUOROCARBON SURFACES, DISTRIBUTED IN EXPANDABLE THERMOPLASTIC COMPOSITIONS WHICH CONTAIN VOLATILIZABLE BLOWING AGENTS, PROVIDE EXTREMELY EFFECTIVE FOAM NUCLEATION DURING EXPANSION OF THE COMPOSITION, RESULTING IN A LARGE NUMBER OF FOAM BUBBLE NUCLEI PER UNIT VOLUME.
Inventors
- 👤 Robert H Overcashier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:32
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2427/00; Y; Y10; Y10S; Y10S264/00; Y10S264/19; Y10S521/00; Y10S521/908
Claims Analysis
Total Claims: 0
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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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |