Last month, Twitter co-founder Isaac "Biz" Stone jotted down in a blog post his intention of trademarking the term "Tweet," which at the time probably seemed like a slam dunk request. Instead, the request is turning out to be no easy layup as the U.S. Patent and Trademark Office has preliminarily denied the patent app.

Whether or not the decision is fair, we'll leave that up to you decide, but here's the deal Three other companies -- TweetMarks, Cotweet, and Tweetphoto -- already have pending applications for trademarks that contain "tweet" in their names. This was enough to make the Patent Office gunshy in granting Twitter's request, at least for now, even though Stone expressed in his blog his company's willingness to let developers use the term.

"We have applied to trademark Tweet because it is clearly attached to Twitter from a brand perspective but we have no intention of 'going after' the wonderful applications and services that use the word in their name when associated with Twitter," Stone wrote on the same day the patent application was filed. "In fact, we encourage the use of the word Tweet. however, if we come across a confusing or damaging project, the recourse to act responsibly to protect both users and our brand is important."