This is a proceeding under R.S. 4915.1 The invention in dispute is an integrally woven ladder web for Venetian blinds, the. web consisting of two vertical outer bands having cross-straps therein on which the slats of a Venetian blind may rest. Prior to the present invention, when two vertical outer bands were made of different colors for decorative purposes, the interweaving of threads of the two colors to make the cross-straps resulted in showing specks of different colors in the areas where the cross-straps were bound-in with the outer bands. The present invention overcomes the defect by making the warp threads of the cross-straps in two colors; each alternate thread being of the color of one of the outer bands and the other alternate thread being the color of the other outer band; the binding-in of the cross-strap warp thread being accomplished in such manner as to bind in only the corresponding color in each of the bands; the process being more elaborately described in Count 1 set out in the margin.2 The Patent Office concluded that appellant, George Frederick French, was the first to conceive and disclose the invention. The District Court, on the other hand, awarded priority to Colby.

Colby’s date of disclosure is March 6, 1939. Whether ‘French is entitled to an earlier date depends upon the interpretation which should be placed upon the following facts: [1] On January 27, 1939, appellants sent, from their office in England, to their office in New York, a letter,3 directed to the attention of Mr. Harris, which described the invention and enclosed a sample; [2] this letter was received during the» first week of February by Miss Donovan and *884Mr. Harris; [3] on February 27, 1939, Miss Donovan prepared a memorandum which described the ladder web in issue and the fact that Harris was to discuss it with Gibbons, manager of appellants’ mill at Fall River, Massachusetts; [4] Harris went to Fall River, with the memorandum and the French sample and disclosed the ladder web to Gibbons “early in March, 1939;” [5] the first written record made by Gibbons concerning the invention is a chain draft, dated March 10, 1939.

The trial judge concluded as a matter of law: “For a date of invention to be established in this country by reason of the introduction of a foreign invention, some person in this country must be capable of understanding the invention and the date of such person’s -understanding the invention is the date established.” He found as facts that Gibbons was the only technical French 'affiliate in the United States who could understand the invention and that the earliest proven date of knowledge and understanding of the invention was March 10, 1939. On this appeal, appellees conceded that Harris showed the sample product to Gibbons before March 6, 1939, but denied that this constituted a disclosure and argued that “it was necessary for him to examine a specimen under a magnifying glass in order to understand it;” consequently, that French cannot go back of March 10, 1939, the date which appears on the chain draft prepared by Gibbons.

We agree with the Patent Office that French is entitled to a date early in February, 1939, when his letter was received in New York.4 The letter specified the problem to be solved, described the solution, and enclosed a sample. The' invention is sufficiently simple5 to be understood, even by a non-expert person. But -in any event, it passes belief that Gibbons, an admitted specialist, who had been working toward a solution of the same problem, should have had the slightest difficulty in understanding the invention when the sample was shown to him prior to March 6, 1939.

Reversed.