(with disposable collector plates)
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November 16, 1966
Copyrighted © by The Townsend Brown family. All rights reserved.
In applicant's patent No. 2,949,550 entitled "Electrokinetic Apparatus," the
claims are directed to the use of an assembly of fine wires and plates to
produce a flow of air (or other fluid dielectric). In Bennett patent No.
_______, the specification teaches the use of essentially the same physical
structure although it was indicated the apparatus was not useful in "dirty"
In applicant's patent No. 2,949,550, no specific reference was made to its
effectiveness as an electrostatic precipitator. This use was discovered
after the patent application was filed. Now, it appears the principle
utility of the device is in this area, i.e. as a self-propelling (fanless
or motorless) electrostatic precipitator.
There seems to be a possibility (notwithstanding the fact that this patent
was duly examined and claims granted) that the existence of the Bennett
patent was not discovered or known to the examiner, and this Brown patent
may have passed to issue in error. If such is the case, Brown patent No.
2,949,550 may be found to be invalid.
The present application, therefore, is to include claims directed to the use
of cleanable (washable) or disposable precipitator plates, instead of fixed
plates, to cure this oversight and dilemma. The apparatus to be patented is
physically similar to patent No. 2,949,550 but includes now
wires and precipitator electrodes specifically adapted to be removed for
cleaning or replacement.
Hence, it is subsequently determined that patent 2,949,550 is invalid and in
the public domain because of the Bennett prior teaching. The addition of the
removable electrode feature, as a patentable and useful device, should
restore protection. The present application not only should stand on "its
own feet" as a patent, but should eliminate the Bennett difficulty.
T. Townsend Brown
Nov. 1, 1966
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