US 5418070
TRI-LAYER IMPREGNATED CATHODE
Assignee
VARIAN ASSOCIATES, INC., PALO, ALTO, CALIFORNIA, A CORP. OF DE
Filed
Apr 28, 1988
Granted
May 23, 1995
Location
PALO ALTO CA US
Abstract
An impregnated cathode comprising three layers: a very thin emitting surface layer of metal such as an alloy of tungsten with a high fraction of an activating metal of the platinum group to provide low workfunction; an underlying, thin buffer layer of porous tungsten alloyed with a fraction of activating metal, to retard diffusion loss of activating metal from the emitting layer; and a substrate of porous tungsten impregnated with barium aluminate.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Mar 6, 1989
Rescinded
Sep 19, 1994
Duration
5 years, 6 months
Inventor
- 1MICHAEL C. GREEN
Record Details
- Patent number
- US 5418070
- Application
- 00071871
- Aerospace match
- No
- Dataset source
- 35 USC §181 SO records
Browse by Assignee
VARIAN ASSOCIATES, INC., PALO, ALTO, CALIFORNIA, A CORP. OF DEBack to patent indexSource: USPTO 35 USC §181 secrecy order records