Keypads: Apparatus and methods of making
US5909021A · kind A · utility
50Cited by
5References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 19, 1998 |
| Grant date | Jun 1, 1999 |
| Priority date | — |
| Expiry date | May 19, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49105
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The keypad is made of a) a formed plastic shell; b) graphics and background printed on the interior surface of the formed plastic shell; and c) a plastic filling the hollow cavity or cavities of the formed plastic shell. The formed plastic shell of the keypad is a polycarbonate and the plastic filling the hollow cavities is a thermoplastic resin or an elastomer. Additionally, the background printed on the interior surface of the formed plastic shell is made with a flexible ink and the keypad has a wear resistance test score in a Norman tester of greater than 40 cycles before the ink on the keypad fails on abrasion testing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.