Combination lock monitoring system
US4453390A · kind A · utility
25Cited by
7References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1982 |
| Grant date | Jun 12, 1984 |
| Priority date | — |
| Expiry date | Jan 6, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/8081
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A combination lock monitoring system for recognizing and indicating electronically the condition of operation of the lock, the recognition being achieved by photo sensitive means responding to the light reflecting quality of areas on the lock bolt mechanism, the lock drop arm and a combination wheel of the combination lock, the electronic circuit responding through a binary code to the condition of the photo sensitive means, and the indication including a visual display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.