A good HR director will come out and tell you if you're no longer being considered for the position. That said, I've come across very few good HR directors in my various job hunts. Usually you never hear from them again.
It hasn't been that long, though - sometimes companies can really drag their feet. It can be weeks or months between the time a decision is made to hire someone and that person's first day - usually because there is a lot of red tape. It's also a holiday week and it's summer, so there may be a key decision-maker or two who are out on vacation. They may also have been waiting for the new quarter to start. So I wouldn't worry too much just yet.
Good luck.
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