This company is sending out letters to people who are due to renew a patent, it looks official and you get the impression that it is from the Patent office IT IS NOT.
They inform you that you need to renew you patent or loose it. First you have to sign a form which basically means you agree to their charge for renewing your patent for one year. The charge is 889, the patent office charge a fraction of this.

If you receive a letter from this company, do not send them any money, send the letter to the International Patents office.