Link to US labelling requirements

Hello i am familiar with Canadian labeling requirements but cannot find clear US requirements.  I am looking for specification in regards to height requirements of company name, if there must be a space between weight and unit size such as 4 oz or 4oz.  There must also be requirements to the size of the size of this and whether it should be in  bold or not.   Anyone have an idea where i could find this kind of information. the website isn't to helpful in terms of this type of information.

thanks

http://www.fda.gov/F.../ucm2006828.htm