Electrically-operated backup alarm
US4603317A · kind A · utility
33Cited by
4References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 8, 1982 |
| Grant date | Jul 29, 1986 |
| Priority date | — |
| Expiry date | Nov 8, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60Q1/54
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An improved electrically-operated backup alarm for use on mobile construction and industrial machinery, including selectable lower and higher loudness levels, automatically adjustable loudness level with respect to varying ambient noise level in which the alarm is operating, high and low frequency compensation to substantially eliminate high and low frequency signal components of the sensed ambient noise, and compensation for responding to transient signal components of the sensed ambient noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.