405.03(a)    Description of Limit

37 CFR § 2.120(d)(1)  The total number of written interrogatories which a party may serve upon another party pursuant to Rule 33 of the Federal Rules of Civil Procedure, in a proceeding, shall not exceed seventy-five, counting subparts, except that the Trademark Trial and Appeal Board, in its discretion, may allow additional interrogatories upon motion therefor showing good cause, or upon stipulation of the parties. A motion for leave to serve additional interrogatories must be filed and granted prior to the service of the proposed additional interrogatories and must be accompanied by a copy of the interrogatories, if any, which have already been served by the moving party, and by a copy of the interrogatories proposed to be served..

The total number of interrogatories which a party may serve on another party, in a proceeding, may not exceed 75, counting subparts, except that the Board, may allow additional interrogatories on motion therefor showing good cause, or on stipulation of the parties. [ Note 1.] See TBMP § 519. Parties may also stipulate that the limit on interrogatories shall be fewer than 75.

NOTES:

 1.   See Baron Phillippe De Rothschild S.A. v. S. Rothschild & Co., 16 USPQ2d 1466, 1467 n.5 (TTAB 1990) ("good cause will generally be found only where a legitimate need for further discovery by means of interrogatories is shown . . . the fact that the additional interrogatories served by opposer may be relevant and narrowly drawn to a single issue is insufficient, in and of itself, to demonstrate good cause.")..