1.Details of equipments purchased after nov2004
2.Details of equipment were purchased after nov2004
“Equipment” is collective; there is no reason to make it plural. (To many people, using it as a plural would indicate ignorance, so avoid this. We see this all the time with the word “software.” Any native English speaker who sees the word “softwares” in an advertisement knows immediately that the person advertising the product is from a non-English speaking country and that the origin of the software is suspect.)
#2 means that the details were purchased, which is probably not your meaning. We assume you meant that the equipment was purchased, not the details.
Of course, “November,” is always capitalized. In English it is considered a proper noun.
This sounds more like a title than a complete sentence: “Details of equipment purchased after Nov. 2004.”
If you wanted to make it a sentence, you would probably say something like “Here are the details about equipment purchased after November 2004.”
I hope this helps