Fire-proofing of elements provided with cavities containing a powdered infill material
Abstract
Abstract A PREFABRICATED PANEL HAVING FIREPROOF CHARACTERISTICS, SAID PANEL HAVING INTERNAL CAVITIES FILLED WITH A PULVERULENT MIXTURE COMPRISING A SMALL PROPORTION OF BORAX WHICH AGGLUTINATES THE MIXTURE UPON HEATING, THUS PREVENTING THE FLOWING OF THE MIXTURE OUTSIDE THE CAVITIES WHEN THE PANEL IS PERFORATED UP TO THE CAVITIES UNDER ACTION OF A FLAME. PREFERABLY, LESS THAN 60 GRAMS OF FINELY POWDERED BORAX PER LITER OF MIXTURE IS THOROUGHLY DISPERSED IN THE REMAINDER OF THE MIXTURE, WHICH IS USUALLY A GRANULAR SOUND INSULATING AGENT SUCH AS SAND, ASBESTOS, REFRACTORY EARTH, CEMENT, ETC. IF DESIRED, THE MIXTURE MAY BE PARTIALLY PRE-AGGLUTINATED BY MODERATE HEATING. IN ADDITION, A SMALL PROPORTION OF BORAX MAY BE ADDED TO ANY ADHESIVES USED IN MAKING THE PANEL.
Inventors
- 👤 Charles Emile Zwickert
Bibliographic Details
Claims Analysis
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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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |