Moisture sensing apparatus
US6559772B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 2001 |
| Grant date | May 6, 2003 |
| Priority date | — |
| Expiry date | Jul 24, 2021 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F13/42
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An apparatus for sensing moisture in a diaper comprises a portable alarm unit, a pouch-like diaper insert made from waterproof dental bib material with an opening at one end and a moisture sensing strip made of highly efficient liquid absorption and transfer capillary wick material. The wick strip has a substantially short front non-conductive portion protruding out of the diaper insert for placement in a diaper crotch area and a substantially long back portion having a pair of screen-printed spaced apart conductive ink bands which couple electrically at one end to the alarm unit. The conductive ink bands include a terminal tortuous conductive ink pattern screen-printed in close proximity to the substantially short first wick portion to increase moisture contact surface area, minimize moisture transfer distance and significantly reduce the alarm unit response time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.