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:
Apr. 14, 1998
Filed:
Mar. 20, 1996
Shigeo Kamata, Tokyo, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
An apparatus for measuring transmission time is utilized for a data collection system including an observation station situated in a given wide-ranging region, and a collection station for collecting data from the observation station over a transmission line, and is designed for measuring the transmission time necessary for a signal to propagate through a transmission path. The apparatus is configured to have a signal detecting unit for taking out, from a signal indicating unit which indicates the states of various signals to be transmitted through a transmission path of a transmission line using light emitting devices or the like, and for detecting a first signal sent from a collection station in order to start data collection and a second signal returned from an observation station in order to notify that the first signal has been received, in a state in which the data collection system is kept running and the electrically uncoupled state relative to the transmission path is retained; and a transmission time calculating unit for calculating the transmission time of a signal propagating through the transmission path on the basis of a difference between the time instant at which the first and second signals are detected.