Not true for a long time - see 35 USC 114 "Models, specimens" including "The Director may require the applicant to furnish a model of convenient size to exhibit advantageously the several parts of his invention."
This rule was implemented in 37 CFR 1.91: (a) A model or exhibit will not be admitted as part of the record of an application unless it:
(1) Substantially conforms to the requirements of § 1.52 or § 1.84;
(2) Is specifically required by the Office; or
(3) Is filed with a petition under this section including:
(i) The fee set forth in § 1.17(h); and
(ii) An explanation of why entry of the model or exhibit in the file record is necessary to demonstrate patentability.
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Date: 2006-10-16 07:11 pm (UTC)This rule was implemented in 37 CFR 1.91:
(a) A model or exhibit will not be admitted as part of the record of an application unless it:
(1) Substantially conforms to the requirements of § 1.52 or § 1.84;
(2) Is specifically required by the Office; or
(3) Is filed with a petition under this section including:
(i) The fee set forth in § 1.17(h); and
(ii) An explanation of why entry of the model or exhibit in the file record is necessary to demonstrate patentability.