7. Patents

		As at							As at
		November 1,							October 31,
		2021		Additions			Disposals		2022
Cost	$	681,288	$	-		$	-	$	681,288
Accumulated amortization		677,411		3,877			-		681,288
Net book value	$	3,877	$	(3,877	)	$	-	$	-

		As at							As at
		November 1,							October 31,
		2020		Additions			Disposals		2021
Cost	$	681,288	$	-		$	-	$	681,288
Accumulated amortization		669,411		8,000			-		677,411
Net book value	$	11,877	$	(8,000	)	$	-	$	3,877

The Company holds several patents in the United States for its Multimodal Fluid Condition Sensor Platform. In prior years, the Company had negotiated with a major automotive company and a Tier 1 manufacturer for the development and commercial exploitation of this patented technology. The Company maintains that there remains significant potential value in its existing patents in terms of potential licensing agreements and royalty fees once it begins to exploit this asset class in the future.