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Is it possible to do search class numbers based on the title/text/description relating the class. On EPO and WIPO yiu can search for classes based on text search.

I couldn't find any such feature on USPTO. Number search is only available with USPTO.

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Look at the classification here. You can download the pdf and search in this.

Furthermore you can use the uspto advanced search and use the operater ccl/ (current classification):

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Recently the US and EPO adopted a new merged classification system CPC. I would use the EPO's CPC page to keyword search for classes and then use those classes in a US search by CPC classification.

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