Passive marker device
US4761656A · kind A · utility
25Cited by
5References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 23, 1986 |
| Grant date | Aug 2, 1988 |
| Priority date | — |
| Expiry date | May 23, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/40
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A passive marker device including a tuned circuit enclosed in a housing which includes a base member with an upstanding rim with a cover member bonded to the rim and to a central portion of the base member. An opening is provided that extends through the housing at the central portion of the housing. A boss extends from the central portion of the base member to the cover member. The boss is recessed on the side of the base member that is away from the cover.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.