Lock impressioning key
US4817406A · kind A · utility
2Cited by
3References
1Claims
0Family size
Inventor
Key dates
| Filing date | Aug 7, 1987 |
| Grant date | Apr 4, 1989 |
| Priority date | — |
| Expiry date | Aug 7, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7802
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An impressioning key for making an impression of the tumblers of a lock comprises a key blank having a main portion of relatively hard material with a recess in an upper forward edge portion. A tumbler engaging portion consisting substantially wholly of lead is secured to the main portion in the recess, the tumbler engaging portion being a solid pre-shaped body of lead filling the recess.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.