what is d diff between trade mark & patent?

Trade mark is simlpy registration of the name of the item eg Coca cola. Patent is a registration of a production process or invention.

Depreciation is a way of indicating how the value of a piece of equipment is recorded eg new £100, after 1 year £70, 2 year £ 40, 3 year £10 - after that of nio value in the assets of the company although it could still be in use.

Amortisation is similar but usually applies to non-tangible assets eg good-will or intellectual property.

Trade mark is a mark on which u trade your stuff.. means is your or specific sign on you trade... and patent is the rights on the product that u make or manufacture...