Patent US4049864A successfully refreshed from Google Patents.
US4049864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Penetration resistant barrier
Assignee: Energy Research and Development Administration ERDA
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Filing: 1976-02-12
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Granted: 1977-09-20
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Expires: 1996-02-12
Abstract
Abstract The disclosure relates to a barrier for resisting penetration by such as hand tools and oxy-acetylene cutting torches. The barrier comprises a layer of firebrick, which is preferably epoxy impregnated sandwiched between inner and outer layers of steel. Between the firebrick and steel are layers of resilient rubber-like filler.
Inventors
- 👤 William R. Hoover
- 👤 Keith E. Mead
- 👤 Henry K. Street
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:03
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/06; B32B15/18; B32B25/00; B32B25/20; B32B3/00; B32B3/10; B32B3/18; B32B9/00; B32B9/04; B32B9/043; E; E05; E05G; E05G1/00; E05G1/02; E05G1/024; F; F41; F41H; F41H5/00; F41H5/02; F41H5/04; F41H5/0414; B32B2260/00; B32B2260/04; B32B2260/046; B32B2307/00; B32B2307/50; B32B2307/536; Y; Y10; Y10S; Y10S428/00; Y10S428/911; Y10T; Y10T428/00; Y10T428/26; Y10T428/31504; Y10T428/31511; Y10T428/31525; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
A barrier for resisting penetration by cutting torch and hand tools comprising: an outer plate of mild steel from about 50 mils to about 1 inch thick; a first layer of silicone rubber from about 1/8 inch to about 1/2 inch thick; a layer of epoxy resin impregnated ceramic firebrick up to about 1 foot thick; a second layer of silicone rubber from about 1/8 inch to about 1/2 inch thick, said first and second layers of silicone rubber sandwiching said ceramic firebrick layer between them; and an inner plate of mild steel from about 50 mils to about 1 inch thick, said inner and outer plates of steel sandwiching between them said first mentioned sandwiched firebrick and silicone rubber layers.
Claim 2
Dependent Claim
121 words
A barrier for resisting penetration by cutting torch and hand tools comprising: an outer plate of mild steel from about 50 mils to about 1 inch thick; a first layer of silicone rubber from about 1/8 inch to about 1/2 inch thick; a layer of epoxy resin impregnated ceramic firebrick up to about 1 foot thick; a second layer of silicone rubber from about 1/8 inch to about 1/2 inch thick, said first and second layers of silicone rubber sandwiching said ceramic firebrick layer between them; and an inner plate of mild steel from about 50 mils to about 1 inch thick, said inner and outer plates of steel sandwiching between them said first mentioned sandwiched firebrick and silicone rubber layers.
Claim 3
Dependent Claim
23 words
The invention of claim 1 wherein said epoxy resin impregnated firebrick comprises 3000° F firebrick impregnated with epoxy resin and butadiene acrylonitrile modifier.
Claim 4
Dependent Claim
18 words
The invention of claim 1 wherein said firebricks are separated from one another by strata of silicone rubber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |