Shielding material and shielded room
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 26, 1989
Grant Date -
N/A
app pub date -
Oct 20, 1988
filing date -
Oct 20, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A shield for electromagnetic radiations comprising a laminated sheet having exterior layers of copper which sandwich an interior layer of a ferromagnetic alloy taken from the class consisting of nickel-iron compounds having from about 42 to about 80 percent nickel by weight and iron as a substantial portion of the remaining material. The layers are metallurgically bonded to each other by sintering or the like. According to a second embodiment, a laminated sheet is provided having exterior layers of copper which sandwich plural interior layers of ferromagnetic material, the layers of ferromagnetic material having progressively higher permeability and being capable of shielding interference of progressively lower energy level when travelling in a direction away from the direction of the source of interference. A typical laminated sheet in the direction away from the source of interference is copper/permendur/80/copper. A further typical such laminated sheet in the direction away from the source of interference is copper/49/80/copper. In those instances where it is known that no high frequencies will be encountered, the copper layers can be removed. It is necessary that each successive layer in the direction away from the source of interfering electromagnetic radiations be at maximum permeability range at a lower interference energy level.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully