Transponder including a fluid cushioning medium and a method for its production
US5731957A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1996 |
| Grant date | Mar 24, 1998 |
| Priority date | — |
| Expiry date | Jun 24, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/077
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Transponder A,B! formed of a bottom-closed elongate tubular enclosure 12! having a mouth 12'! at an upper end and circuit-receiving space within the enclosure for fully receiving an electronic transponder circuit assembly 15!. A cap 14,114! closes the mouth, the enclosure and cap each being of tough synthetic resin material which will not be damaged by being dropped and is intrinsically capable of absorbing shock to a substantial degree when so dropped. The circuit assembly is completely immersed in silicone oil or gel cushioning medium 16! so that it completely surrounds the circuit assembly in all directions, the cushioning medium providing absorption of impact energy. The silicone cushioning medium when within the closure has its fluid level extending above the seal and above an upper end 15'! of the circuit assembly. The cap is hermetically joined to the enclosure by ultrasonic welding. The transponder repeatedly survives a 2-meter drop test without failure of the circuit assembly. Method for assembling the transponder involves introducing silicone fluid is introduced into the enclosure using a dispensing needle having a tip placed at a closed bottom of the enclosure in order t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.