Patents - Costs and accumulated amortization of patents (Details) - USD ($)	12 Months Ended
Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Accounting Policies [Abstract]
Patents	$ 25,851
Net patents acquired during acquisition of HDS		$ 27,221
Less: Amortization expense	2,571	1,370	$ 1,370
Patents, Net	$ 23,280	$ 25,851
Weighted Average Life	9 years

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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