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- From: peltz@cerl.uiuc.edu (Steve Peltz)
- Subject: Re: Looking for prior art for US Patent #4,624,462
- References: <FRIEDMAN.93Jan25002822@nutrimat.gnu.ai.mit.edu> <C1FqwB.GDs@csn.org>
- Message-ID: <C1Is5w.DsH@news.cso.uiuc.edu>
- Sender: usenet@news.cso.uiuc.edu (Net Noise owner)
- Organization: Computer Based Education Research Lab - University of Illinois
- Date: Wed, 27 Jan 1993 15:53:56 GMT
- Lines: 71
-
- In article <C1FqwB.GDs@csn.org> dfishman@teal.csn.org (Dan Fishman) writes:
- >Let me get this straight! You think that keeping the prior art (if any) from
- >the plaintiff is the winning strategy? ...
- > ... Bring your prior
- >art to trial to invalidate the patent (by the way, see how the judge feels
- >about trial by surprise when you withhold your crucial evidence from the
- >other side).
- >
- >If the PTO has already considered your prior art (as found by orderring the
- >"file wrapper" for the patent (all the stuff considered by the PTO and the
- >patent holder)), then you'll get nowhere with the PTO... save your efforts
- >for the trial. If they haven't considered it, the re-examination is the
- >best (cheapest) way for your client to get the patent invalidated.
- >
- >So why is it again you need this to be kept secret???
-
- Apparently, RMS talked about this a little bit when he spoke here at UIUC
- (which I missed due to a prior commitment, argh!). The problem is if the
- patent holder brings the reference to the prior art to the PTO, says "we
- wish to have this considered, and here's why it doesn't apply to our
- patent"; the PTO then rubber-stamps it and now it is on record as not
- being applicable prior art, which makes any further legal actions much
- more difficult and costly. By forcing the prior art to be examined in
- broad daylight, as it were, it can be more fully disclosed. Anyway, that's
- my understanding of the possible pitfalls of allowing the patent holder
- to instigate the re-examination.
-
- >Note that any real analysis requires a detailed reading of the entire patent
- >including the figures to find holes or weaknesses if they exist!
-
- True, but for finding prior art that MAY apply, the abstract and claims are
- about as good as you need. Presumably a lawyer will then sift through anything
- discovered and determine what is actually applicable.
-
- >Now read this carefully. Does your client do everything this claim says:
- >(does the claim read on you clients invention)
-
- Since the patent holder is suing for infringement, obviously THEY think
- so!
-
- [list of claims omitted]
-
- >Now read the rest with the same careful eye. Notice first that each of
- >the following claims (2-7) are "dependent" claims, they are read in
- >conjunction with claim 1, your client must must do everything in claim
- >2 AND claim 1, or claim 3 AND 2 AND 1, 4 AND 2 AND 1, 5 AND 1, 6 AND 1,
- >7 AND 1.
-
- [list of dependent claims omitted]
-
- Note that in a re-examination, even if the independent claim is killed,
- they might get by with re-writing it to also include one or more of the
- dependent claims, if the prior art doesn't cover all of them. If the
- alleged infringement included the dependent claims, they are still in
- trouble. This is why there ARE dependent claims. The DEC patent that
- was the subject of a previous inquiry to the net for prior art seemed
- to have been through at least one re-examination where the claims had
- already been significantly narrowed (BTW, it might be nice to hear the
- gory details of the outcome of that case).
-
- Now, here's a question: a patent holder of a broadly written patent
- claims that something infringes. Prior art is found that doesn't
- seem to exactly fit the claims, but is practically identical to the
- claimed infringement. If it goes to trial, is it more likely that the
- patent will be invalidated, or found that the patent doesn't apply to
- the case (since to try to prove that it WAS infringing is tantamount
- to proving that the prior art also applies to the patent, and thus
- the patent should be invalidated)?
- --
- Steve Peltz
- Internet: peltz@cerl.uiuc.edu PLATO/NovaNET: peltz/s/cerl
-