H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/6, 340/74
H04M 11/00 (2006.01)
Patent
CA 1298630
RESIDENTIAL FUEL-OIL LEVEL REPORTING AND ALARM SYSTEM An automatic reorder and alarm system for use with residential fuel-oil tanks which sends reorder and alarm data to a central station over the direct-dial telephone network when the fuel-oil level in the tank falls below a predetermined value or when an alarm situation, such as low temperature, occurs at the tank location. An inexpensive sensor/sending unit located at each customer tank includes a simple sensor which mounts on either the tank or an existing fuel-oil level gauge, a microcontroller circuit and a modem circuit. The microcontroller circuit uses a simple low-stability oscillator as a reference for internal operations and for modem transmission frequencies. Because the oscillator frequency cannot be precisely determined due to component tolerances and has a substantial amount of drift, a special data transmission format is used for data transmission over the telephone lines between the microcontroller and the central station. The data format consists of a selected pattern of mark and space signals in which each mark signal consists of a predetermined number of cycles of an oscillating signal whose frequency is determined by the internal modem oscillator and each space signal is an equivalent time period without a signal. At the receiver the bit time duration is determined by averaging bit times in a predetermined bit pattern header.
546723
Banks Frank H.
Defrancesco Robert A.
Knight John D.
Mitchell Andrew
Shapiro Robert D.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Scully Signal Company
LandOfFree
Residential fuel-oil level reporting and alarm system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Residential fuel-oil level reporting and alarm system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Residential fuel-oil level reporting and alarm system will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1205447