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Showing contexts for: Temperature sensor in Strix Ltd vs Maharaja Appliances Limited on 20 October, 2023Matching Fragments
7. The case of the Plaintiff is that the invention in the Suit Patent has been used by the Plaintiff since 2002. The principal claim of the Suit Patent is that of a liquid heating vessel comprising a liquid receiving container and an electrical heating element provided in thermal contact, with the base of the container. It is stated to contain a thermally sensitive overheat control comprising of at least two thermally responsive sensors arranged in "good thermal contact with and at spaced apart locations on the base of the container or the element said sensors individually being operable, in the event of said element overheating due to the vessel being switched on dry or boiling dry but not during normal boiling operation of the vessel so as to interrupt or reduce the supply of electrical energy to the element." In other words, the patented controls work based on sensing the temperature of the element, the element gets switched off once a certain temperature is reached. For the sensors of the Suit Patent to work, therefore, there is no need for the container itself to contain the liquid. The relevant claims of the Plaintiff read as under:
Claim - 1 Claims a liquid heating Claims a temperature control
vessel wherein the two device wherein the device
thermally responsive comprises of a sensing
sensors are arranged means to provide an
in good thermal indication of the temperature
contact and at spaced of the liquid in vessel and an
apart locations on the another sensing means
base of the container. adapted to sense the
temperature of outer wall of
vessel and providing an
indication of ambient
temperature.
2. Position of Sensors placed on One in close proximity with
sensors same surface on the the wall of the vessel
carrier and are container and other in such a
preferably 180° around position wherein it can sense
the vessel base. These the temperature of the outer
sensors are positioned wall of vessel and ambient
so as to sense the temperature also. This
temperature of the base sensor as shown in the which is in close figures is not going to sense proximity of the the temperature of the heating coil. heating element or any location near to the same.
Boiling Boiling controls used This is an alternative system
controls used for boiling control.
Temperatures Both sense temperature One of the sensors senses the
read by the on the base of the temperature of the wall of the
sensors vessel vessel and the other senses
the temperature of the wall of
the vessel and also ambient
temperature through air thus
this sensor gives a
temperature reading between
the temperature of the vessel
wall and the ambient
temperature.
THE SENSORS IN THIS
CASE PARTICULARLY
CANNOT BE POSITIONED
NEAR THE HEATING
ELEMENT AS THE
MOTIVE HERE IS TO
SENSE THE
TEMPERATURE OF THE
LIQUID IN THE VESSEL SO
THAT THE SET POINT CAN
BE ADJUSTED
ACCORDINGLY, AND
ACCORDINGLY THE
POWER SUPPLY TO THE
HEATING ELEMENT IS
CUTOFF WHEN THE
LIQUID IN THE VESSEL
REACHES THE DESIRED
TEMPERATURE.
Requirement Not required This is an essential
of a requirement in the
comparator embodiments discussed in
this case.
Problem In case of overheating This invention prevents boil
solved due to the possibility over of any liquid heated in a
when vessel is turned liquid heating vessel. The
on without the liquid or problem as solved here is