The general rule is that the revocation is effective only when it is made known to the offeree. Until it is communicated to the offeree, directly or indirectly, the offeree has reason to believe that there still is an offer that may be accepted. The offeree may rely on this belief. If the offeror seeks to revoke the offer, but the offeree accepts the offer before notice of the revocation, a valid contract is created. - See more at: http://contracts.uslegal.com/offer/termination-of-offer/#sthash.Yj5clKz8.dpuf