Grant of patent

Tristel PLC
03 January 2008



                                  TRISTEL plc



                                Grant of Patent



Tristel plc ('Tristel'), the AIM listed provider of infection and contamination
control products, announces that it has been granted a patent by the European
Patent Office for its chlorine dioxide generation system.  The new patent, EPO
no 1644051, relates to Tristel's Generator which is used to dispense Tristel's
proprietary chlorine dioxide chemistry.



Tristel Generators are employed in the decontamination of endoscopes in a number
of United Kingdom hospitals with Tristel products being used in over 375
hospitals, representing some 60 per cent. of all UK NHS Acute & Private
Hospitals.



Tristel is in the process of adapting the Generator for use in buildings' water
supply systems, enhancing the capabilities of its Tristel Technologies
subsidiary which focuses upon legionella control.



Tristel operates through two subsidiaries: Tristel Solutions, which provides
infection control products based on chlorine dioxide chemistry to the healthcare
marketplace and Tristel Technologies, which uses chlorine dioxide chemistry for
legionella control in buildings' water systems (including those of hospitals)
and contamination control in the food growing and processing industries.



Contacts:


Tristel plc

Paul Swinney, Chief Executive                     Tel: [phone]

Daniel Stewart & Company Plc
Oliver Rigby                                      Tel: [phone]

Parkgreen Communications Ltd                      Tel: [phone]
Paul McManus                                      Mob: [phone]
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