We remark secondly that whether the use of an invention is
public or private does not necessarily depend upon the number of
persons to whom its use is known. If an inventor, having made his
device, gives or sells it to another, to be used by the donee or
vendee without limitation or restriction or injunction of secrecy
and it is so used, such use is public even though the use and
knowledge of the use may be confined to one person.
We say thirdly that some inventions are by their very character
only capable of being used where they cannot be seen or observed by
the public eye. An invention may consist of a lever or spring,
hidden in the running gear of a watch, or of a rachet, shaft, or
cog wheel covered from view in the recesses of a machine for
spinning or weaving. Nevertheless if its inventor sells a machine
of which his invention forms a part, and allows it to be used
without restriction of any kind, the use is a public one. So, on
the other hand, a use necessarily open to public view, if made in
good faith solely to test the qualities of the invention and for
the purpose of experiment, is not a public use within the meaning
of the statute.
Elizabeth v. Pavement Company,
97 U. S. 126;
Shaw v.
Cooper, 7 Pet. 292.
Page 104 U. S. 337
Tested by these principles, we think the evidence of the
complainant herself shows that for more than two years before the
application for the original letters, there was, by the consent and
allowance of Barnes, a public use of the invention covered by them.
He made and gave to her two pairs of corset steels, constructed
according to his device, one in 1855 and one in 1858. They were
presented to her for use. He imposed no obligation of secrecy nor
any condition or restriction whatever. They were not presented for
the purpose of experiment, nor to test their qualities. No such
claim is set up in her testimony. The invention was at the time
complete, and there is no evidence that it was afterwards changed
or improved. The donee of the steels used them for years for the
purpose and in the manner designed by the inventor. They were not
capable of any other use. She might have exhibited them to any
person, or made other steels of the same kind and used or sold them
without violating any condition or restriction imposed on her by
the inventor.
According to the testimony of the complainant, the invention was
completed and put into use in 1855. The inventor slept on his
rights for eleven years. Letters patent were not applied for till
March, 1866. In the meantime, the invention had found its way into
general and almost universal use. A great part of the record is
taken up with the testimony of the manufacturers and venders of
corset steels showing that before he applied for letters, the
principle of his device was almost universally used in the
manufacture of corset steels. It is fair to presume that, having
learned from this general use that there was some value in his
invention, he attempted to resume, by his application, what by his
acts he had clearly dedicated to the public.
"An abandonment of an invention to the public may be evinced by
the conduct of the inventor at any time, even within the two years
named in the law. The effect of the law is that no such consequence
will necessarily follow from the invention being in public use or
on sale, with the inventor's consent and allowance, at any time
within the two years before his application, but that if the
invention is in public use or on sale prior to that time, it will
be conclusive evidence of
Page 104 U. S. 338
abandonment, and the patent will be void.
Elizabeth v.
Pavement Company, supra."
We are of opinion that the defense of two years' public use by
the consent and allowance of the inventor before he made
application for letters patent is satisfactorily established by the
evidence.
Decree affirmed.
MR. JUSTICE MILLER dissenting.
The sixth section of the Act of July 4, 1836, c. 357, makes it a
condition of the grant of a patent that the invention for which it
was asked should not, at the time of the application for a patent,
"have been in public use or on sale with the consent or allowance"
of the inventor or discoverer. Section fifteen of the same act
declares that it shall be a good defense to an action for
infringement of the patent that it had been in public use or on
sale with the consent or allowance of the patentee before his
application. This was afterwards modified by the seventh section of
the Act of March 3, 1839, c. 88, which declares that no patent
shall be void on that ground unless the prior use has been for more
than two years before the application.
This is the law under which the patent of the complainant is
held void by the opinion just delivered. The previous part of the
same section requires that the invention must be one "not known or
used by others" before the discovery or invention made by the
applicant. In this limitation, though in the same sentence as the
other, the word "public" is not used, so that the use by others
which would defeat the applicant, if without his consent, need not
be public; but where the use of his invention is by his consent or
allowance, it must be public or it will not have that affect.
The reason of this is undoubtedly that if without his consent
others have used the machine, composition, or manufacture, it is
strong proof that he was not the discoverer or first inventor. In
that case, he was not entitled to a patent. If the use was with his
consent or allowance, the fact that such consent or allowance was
first obtained is evidence that he was the inventor, and claimed to
be such. In such case, he was not to
Page 104 U. S. 339
lose his right to a patent unless the use which he permitted was
such as showed an intention of abandoning his invention to the
public. It must, in the language of the act, be in
public
use or on sale. If on sale, of course the public who buy can
use it, and if used in public with his consent, it may be copied by
others. In either event, there is an end of his exclusive right of
use or sale.
The work
public is therefore an important member of the
sentence. A private use with consent, which could lead to no copy
or reproduction of the machine, which taught the nature of the
invention to no one but the party to whom such consent was given,
which left the public at large as ignorant of this as it was before
the author's discovery, was no abandonment to the public, and did
not defeat his claim for a patent. If the little steep spring
inserted in a single pair of corsets, and used by only one woman,
covered by her outer clothing, and in a position always withheld
from public observation, is a
public use of that piece of
steel, I am at a loss to know the line between a private and a
public use.
The opinion argues that the use was public because, with the
consent of the inventor to its use, no limitation was imposed in
regard to its use in public. It may be well imagined that a
prohibition to the party so permitted against exposing her use of
the steel spring to public observation would have been supposed to
be a piece of irony. An objection quite the opposite of this
suggested by the opinion is that the invention was incapable of a
public use. That is to say that while the statute says the right to
the patent can only be defeated by a use which is public, it is
equally fatal to the claim, when it is permitted to be used at all,
that the article can never be used in public.
I cannot on such reasoning as this eliminate from the statute
the word
public, and disregard its obvious importance in
connection with the remainder of the act, for the purpose of
defeating a patent otherwise meritorious.