Lock and key
US4805428A · kind A · utility
2Cited by
6References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 4, 1987 |
| Grant date | Feb 21, 1989 |
| Priority date | — |
| Expiry date | Aug 4, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7864
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A lock and key combination includes profile shapes extending along the lateral faces of the key which extend at an angle relative to the key spine to make acquisition of replacement key copies more difficult.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.