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:
Oct. 06, 1992
Filed:
Jul. 21, 1989
Terry O Anderson, Duncan, OK (US);
J Mark Richardson, Duncan, OK (US);
Jack C Penn, Duncan, OK (US);
Michael J Lynch, Duncan, OK (US);
Billy W White, Duncan, OK (US);
Gilbert H Forehand, Duncan, OK (US);
Richard L Duncan, Duncan, OK (US);
Charles F VanBerg, Jr, Duncan, OK (US);
Stephen E Tilghman, Duncan, OK (US);
Ronald E Dant, Duncan, OK (US);
Charles D Donaghe, Duncan, OK (US);
Halliburton Company, Duncan, OK (US);
Abstract
A self-contained memory gauge includes either semiconductor or magnetic core memory for retaining downhole information related to sampled parameters, such as borehole temperature and pressure. A microprocessor-based computer manages the power utilization by independently and selectably energizing and de-energizing different sections of the gauge. The magnetic core memory is tested for operability, and the addressing of the magnetic core memory is adjusted in accordance with any inoperable memory locations. Samples of the monitored environmental conditions can be taken at variable rates dependent upon software monitoring of the condition, the remaining battery life and the remaining memory capacity and in response to hardware monitored pressure changes. Each sample can be taken to a selectable resolution. A watchdog circuit monitors the microprocessor to insure that it is operating within a preselected time limit. Further, resolution counters (282) and (284), in association with multiplexer (280), provide selectable timing signals.