US3420923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing foamed plastic articles having outer skin by curing with microwaves
Assignee: Imperial Chemical Industries Ltd
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Filing: 1964-07-27
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Granted: 1969-01-07
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Expires: 1984-07-27
Abstract
No abstract record available.
Inventors
- 👤 Gordon Ashworth
- 👤 John Dunlop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:58
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/34; B; B32; B32B; B32B27/00; Y; Y10; Y10S; Y10S521/00; Y10S521/915
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |