X-ray tube having multiple cathode filaments
US4799248A · kind A · utility
12Cited by
7References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1987 |
| Grant date | Jan 17, 1989 |
| Priority date | — |
| Expiry date | Aug 6, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2235/068
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An X-ray tube having two individually energizable cathode filaments. If a primary filament is shorted to a cathode cup, a switch mounted inside the tube housing is thrown to couple a second filament to a filament energization signal. This avoids the necessity in replacing the X-ray tube if the primary filament is shorted and lengthens the effective life of the X-ray tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.