Fire resistant composition
Abstract
Abstract A container protective against high temperature of restricted duration is formed of a mixture of plaster of paris containing incombustible reinforcing filler, such as glass fibres, and/or insulating filler, such as glass spheres; and a particulate inorganic hydrate, such as magnesium sulphate, which may have a water-insoluble coating. It may also contain an infrared opacifier, such as chromium oxide. The container cover is preferably stepped, to eliminate a direct radiation path between the cover and the container; and the stepped seat or the stepped edge of the cover may be covered with a fusible incombustible material, such as a glass cloth of suitable melting point, to seal the joint between cover and container in the existence of high temperature. The wall structure may be graded, having higher melting filler and reinforcement at the exposed face, and lower melting filler at the interior portions.
Inventors
- 👤 Michael J Noone
Bibliographic Details
Claims Analysis
Total Claims: 3References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |