Longworth v Emerton [1951] HCA 45

Longworth v Emerton [1951] HCA 45

The patentee's use of the invention before the patent application date was not experimental but constituted public user, performed openly and without confidentiality, and invalidated the patent. Section 124 of the Patents Act did not protect the use, as it went far beyond mere exhibition or testing and amounted to prior public use.

Parties
Appellant, Plaintiff, Patentee: Francis Lachlan Longworth; Respondent, Defendant: Harold Silverton Emerton
Jurisdiction
Australia
Procedural Posture
Appeal / Judgment Following Appeal From the Supreme Court of New South Wales (equity)
Outcome
appeal dismissed
Legal Topics
Prior User, Experimental Use, Patent Validity, Public Disclosure, Patents Act S.124
Intellectual Property Patents Prior User Experimental Use Patent Validity Public Disclosure Patents Act S.124

Case Brief

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Parties

Francis Lachlan Longworth

Appellant, Plaintiff, Patentee

Harold Silverton Emerton

Respondent, Defendant

Procedural Posture

Appeal / Judgment Following Appeal From the Supreme Court of New South Wales (equity)

Legal Issues

  1. 1 Whether prior public use by the patentee before the patent application date invalidated the patent
  2. 2 Whether such prior use constituted experimental use protected under s.124 of the Patents Act 1903-1946
  3. 3 Interpretation of 'experimental use' and 'public disclosure' under Australian patent law

Ratio Decidendi

The patentee's use of the invention before the patent application date was not experimental but constituted public user, performed openly and without confidentiality, and invalidated the patent. Section 124 of the Patents Act did not protect the use, as it went far beyond mere exhibition or testing and amounted to prior public use.

Court Disposition

appeal dismissed

Orders

  • Appeal dismissed with costs