Structural material and means and method for making it
Abstract
Abstract Sheet material is made from a sandwich of a dried matrix slurry covered on both sides with a layer of fibrous material. This sandwich material is formed into corrugations having flat ridges prior to drying and hardening. The corrugations may take a number of forms including undulating or serpentine forms providing corresponding undulating ridges and also straight ridges. The sandwich sheets can be formed in a mechanism comprising traveling chains carrying arms with bars which form the desired shaped ridges. A structure is made up by over-laying a plurality of such corrugated sheets. Adjacent corrugated sheets are adhered to each other at the flat ridges. Advantages of structures made from this material reside in strength, rigidity, heat and sound insulation.
Inventors
- 👤 H King
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |