An offer shall become effective when it reaches the offeree.
An offer may be revoked where the revocation reaches the offeree before the latter communicates
his acceptance.
However, an offer cannot be revoked where it is specified that it is irrevocable or where a given
time limit is set for its acceptance.
An offer, even where it is irrevocable, shall end when the offeror receives its rejection.
Official translation
Spot-checked
In force from 17 April 1997
Source page 56