Effect of conversion of partnership firm to private limited company

Partnership firm converted into private limited company in 2005

Directors of the company sold 49 % stake in 2008  and 51% stake  in 2013.

In 2013  new directors entered in company and  all old directors left the company.

Now the old directors, who left the company, are claiming rights over intangible assets ( trademark) stating the in the year 2005 when Partnership firm converted into private limited company, no intangible assets ( trademark) was transferred to company.

In fact , after conversion, company used intangible assets ( trademark) from 2005 to 2008. 

Can  old directors claim right over intangible assets ( trademark) of company?

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