Gahtan Law Office limits its services to technology contracting, e-commerce and related work.  While this may include elements of intellectual property related advice, if you are primarily interested in registering a trade mark or patent, or intellectual property related litigation, you may want to review the services offered by one of the following firms or try the intellectual property departments of one of the larger firms:

Barrigar

Bereskin & Parr
4000-40 King St W, Box 401 Stn, Scotia Pl
Toronto, ON, Canada     M5H 3Y2
(416) 364-7311    

Deeth Williams Wall LLP
150 York Street, Suite 400
Toronto, Canada M5H 3S5
(416) 941-9440

Dimock Stratton LLP  
20 Queen Street West, Suite 3202
Toronto Ontario Canada M5H 3R3
Telephone: (416) 971-7202

Gowling Lafleur Henderson LLP
150 Elgin Street
Ottawa, Ontario K1P 1C3
(613) 233-1781

Hooey Remus  

Ivor M. Hughes
175 Commerce Valley Drive West
Suite 200
Thornhill, Ontario L3T 7P6
(905) 771-6414

Johnston & Buchan LLP
275 Slater Street, Suite 1700
Ottawa, Ontario  K1P 5H9
(613) 236-3882

Kappel Ludlow
1400-439 University Avenue
Toronto, Ontario M5G 1Y8
(416) 408-4565

Macera & Jarzyna
12th Floor, 427 Laurier Ave W.
Ottawa ON, Canada K1R 7Y2
(613) 232-7302   

Oyen Wiggs Green & Mutala LLP
480 - The Station
601 West Cordova Street
Vancouver, British Columbia
Canada V6B 1G1
604-669-3432

Rideout & Maybe LLP
One Queen Street East
Suite 2400
Toronto, Ontario M5C 3B1
(416) 868-1482

Shapiro Cohen
Suite 2001
112 Kent Street
Ottawa, Ontario K1P 6P1
(613) 232-5300

Sim, Hughes, Ashton & McKay LLP
330 University Avenue, 6th Floor
Toronto, Ontario M5G 1R7
(416) 595-1155

Smart & Biggar