The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 13, 2021
Filed:
May. 29, 2018
David H. Parker, Earlysville, VA (US);
David H. Parker, Earlysville, VA (US);
Other;
Abstract
Apparatus and methods to implement post accident communications in a coal mine, in compliance with the MINER Act and MSHA regulations, are disclosed. Acoustic waves are transmitted bidirectionally through-the-earth in a simple robust half-duplex architecture in combination with signal-to-noise reduction techniques which ensure the ability to communicate using simple tools available in a mine. A personal electronics device, designed to be carried by each miner, automatically decodes acoustically transmitted text messages sent by rescue operations, and automatically encodes text messages by a miner to synchronized impulses manually produced by the miner. Signals are synchronized, in time of day protocol, between the miner and rescue operations. Digital signal processing techniques are disclosed.