US3453168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the manufacture of polyurethane foam core sandwich
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1964-06-29
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Granted: 1969-07-01
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Expires: 1984-06-29
Abstract
No abstract record available.
Inventors
- 👤 Harry Edwards
- 👤 Alan Metcalf Wooler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:06
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/20; B29C44/26; B29C44/30; B32; B32B; B32B27/00; B29L; B29L2007/00; B29L2009/00; Y; Y10; Y10T; Y10T156/00; Y10T156/17; Y10T156/1702; Y10T156/1712; Y10T156/1722; Y10T156/1727; Y10T156/1729
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) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |