US3778492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabrication of three-dimensional reinforced foam insulation blocks
Assignee: McDonnell Douglas Corp
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Filing: 1972-04-03
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Granted: 1973-12-11
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Expires: 1992-04-03
Abstract
Abstract A method of making three-dimensional reinforced foam insulation blocks wherein an X, Y, Z grid is made of three reinforcement fibers through which the insulation foam expands in the fabrication process. The placement of Z fibers through the multiple layers of the X-Y grid fibers utilizes a tube array for guidance. Frames for the X-Y fibers form a disposable mold to contain the foam while it expands and cures.
Inventors
- 👤 C Lemons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:18
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/16; B29C70/24; Y; Y10; Y10S; Y10S264/00; Y10S264/63
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |