Pruning Priority to Prolong the Patent

"The examiner is utterly confused about the lineage of this application..."

Thus begins the intriguing prosecution history of a patent that issued on Tuesday.  (Yes, even three feet of snow and the PTO being shut down could not stop the weekly arrivals of issued patents.)

Here are the basics:

U.S. Patent No. 7,658,935  Methods and compositions for stimulating the immune system Inventor: Samuel Bogoch Filed: May 15, 2001 Lineage as filed (and published in U.S. Pub. 2002/0045187): This application is a Continuation-in-Part of my application Ser. No. 07/744,649 filed Aug. 8, 1991, and the prior applications of which it is in turn a continuation-in-part, Ser. Nos. 941,940, 852,200, 621,112, 553,075, 550,432, 450,404, 385,451, and 922,799, which should be incorporated by reference in the present application.  Lineage as issued: This application is a continuation of and claims priority to application Ser. No. 08/031,562, filed Mar. 16, 1993; which is a continuation-in-part of application Ser. No. 07/744,649, filed Aug. 8, 1991, abandoned, to which the instant application also claims priority.              Application Ser. No. 07/744,649 is a continuation of application Ser. No. 07/227,621, filed Aug. 3, 1988, abandoned; which is a continuation of application Ser. No. 06/281,883, filed Jul. 9, 1981, now U.S. Pat. No. 4,976,957; which is a continuation-in-part of application Ser. No. 05/922,799, filed Jul. 7, 1978, now U.S. Pat. No. 4,298,590, and application Ser. No. 06/019,078, filed Mar. 9, 1979, abandoned; application Ser. No. 06/019,078 is a continuation-in-part of application Ser. No. 05/941,940, filed Sep. 13, 1978, abandoned; which is a continuation of application Ser. No. 05/852,200, filed Nov. 17, 1977, now U.S. Pat. No. 4,196,186; which is a continuation of application Ser. No. 04/621,112, filed Oct. 9, 1975, abandoned; which is a continuation-in-part of each of application Ser. No. 04/553,075, filed Feb. 25, 1975, abandoned, application Ser. No. 04/550,432, filed Feb. 18, 1975, abandoned, application Ser. No. 04/450,404, filed Mar. 12, 1974, abandoned, and application Ser. No. 04/385,451, filed Aug. 3, 1973, abandoned. All applications listed above are incorporated herein by reference.

Commentary: If you blinked while reading that, you may have missed an important grammatical mark: the period (emphasized with added space above) ending the first sentence and showing that this patent claims priority ONLY to the '562 application and the '649 application, and NOT to any of the other eleven applications listed there.  And if you've read this blog in the past few weeks, you know immediately why that matters: if the priority chain had not been severed, this patent would have have had an expiration date of August 1993, which is almost eight years before it was even filed. Instead, this patent has over a year of life, plus some extra time for PTO delays. Good move.

Of course, there's more to the story.  By cutting the chain, all the previous links theoretically become available as prior art under 102. Why only in theory?  Because the first severed-off application ("621) was abandoned and unpublished -- and thus is unavailable as a 102(b) reference.  And the '621's parent, which blossomed into the '957 patent, issued in December 1990 -- less than one year prior to the August 1991 priority date of this week's patent. (Surprisingly, the Applicant did not raise the unavailability of the '957 patent when it was cited in a 102(b) rejection along the way, instead choosing to argue on the merits.) And 102(e) does not apply since the inventive entity is the same (not "by another").  In other words, a reference filed twenty years earlier (July 1981) and not in the priority chain is unavailable as prior art. To this, my brother would say, "Only in America. (or was that Don King...)"

But wait.. there's more.  Late in the prosecution, the Applicant was hit with a 112 written description rejection.  The response?  Amend the specification to import language from the grandparent '649 application, thus giving the needed support to the claims. On the surface, that seems fine -- the '649 application is in the priority chain, after all, and it was incorporated by reference. [Note, however, that as of October 2004, such an incorporation of "essential" material from an unpublished application is not proper. 37 CFR 1.57(c).] The peculiarity here, however, is that the '649 application and the '957 patent--not in the priority chain--essentially share the same specification.

Talk about having your cake and eating it. In beating back the 112 rejection, the Applicant relied on language from a twenty-year old document to provide support for his claims; yet the Applicant distanced himself from that same document in order to avoid early expiration.

And it all appears to be legit. Fascinating.