We consider the problem of bargaining over the disclosure of interimresearch knowledge between two participants in an R&D race for an ultimate,patentable invention. Licence fee schedules that are functions of the'amount of knowledge disclosed', by the leading to the laggingagent, are examined for their abilities to attain efficient outcomes andvarying shares of the surplus arising from disclosure. In hersequential-offers bargaining games, the uninformed buyer is able to elicitfull disclosures without sharing the incremental surplus with any type ofthe licensor, and thus do as well as a perfectly informed and discriminatingknowledge licensee.