Fire-proof laminated plywood core
Abstract
Abstract PROVIDED IS A COMPOSITION FOR RENDERING THE CORE OF A LAMINATED PLYWOOD STRUCTURE FIRE-PROOF THE COMPOSITION IN PASTE FORM COMPRISES A VISCOSITY BUILDER, WHICH IS ADMIXED WITH AN AQUEOUS SOLUTION CONSISTING OF TRICRESYL, GLYCERINE, OR GUANIDINE PHOSPHATE, AMMONIUM HALIDE, ZINC CHLORIDE, UREA, OR A COMPOUND THEREOF, A SMALL AMOUNT OF AMMONIUM SULFATE, A WEAK ACID COMPOUND SUCH AS BORIC ACID, AMMONIUM BORATE OR AMMONIUM PHOSPHATE AND A SMALL AMOUNT OF AN ANTIMONY COMPOUND. AFTER PRETREATING THE CORE WITH SILICATE OR DELIQUESCENT COMPOSITION AND IF NECESSARY, PROVIDING A LARGE NUMBER OF SCARS ON THE SURFACE OF THE CORE, THE COMPOSITION IS APPLIED TO THE SURFACE OF THE CORE WHEREINAFTER PERMEATION OF THE COMPOSITION INTO THE CORE IS EFFECTED. AFTER DRYING OF THE CORE, THE UNTREATED THIN FRONT AND BACK VENEERS ARE APPLIED BY GLUING TO THE SURFACES OF THE CORE, THUS PROVIDING A FIRE-PROOF PLYWOOD STRUCTURE OF A SELF-EXTINGUISHING UNTREATED SURFACE VENEER AND TREATED CORE, WHICH HAS EXCELLENT VARNISH-BRUSHABILITY.
Inventors
- 👤 T Handa
- 👤 M Saito
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |