(after stating the facts as above). [ 1J The use of cork in mechanics as a superior and practical frictional agent was long well known in the patent art, as is shown by a number of patents which the record discloses, beginning with No. 20,881, to' Hunt, 1858, “for the construction and use of machine pulleys with the bearing or band surface made of cork.”

In 1883, patent No. 28,128 was granted to Boysen for cork sheets or strips to be cemented on the face of the pulley. Patent No. 573,-252, 1896, to Whitcomb and Coggin, shows a.brake shoe with inserts of cork set into the face of the metal brake shoe. It was also there pointed out that the cork sections may be set into the face of a metal clutch as illustrated in one of the patent figures. Patent to Dissosway in 1899, No. 635,128, shows a series of cork inserts in the rim or face of a pulley wheel. In 1901 Whitcomb was granted patent No. 684,021 for a friction clutch with cork friction inserts extending through a backing of wood into the face of the clutch wheel or cone. The specification points out that other material may be used for the backing, and that clutch or brake may be applied to automobiles, and that in practice a band or strap is adapted to be applied to the rim. Plain indurated woven fabric strips, of the dimensions and general characteristics as those employed by appellants and appellees, were long in quite general use for Eord cars; such strips being part of their regular equipment. Great quantities of them are sold.

Appellants’ witnesses, in pointing out the virtue of the cork inserts, indicate as a prime factor of their superiority their protrusion, so that on contraction of the metal band the cork will first contact with the drum, giving primarily the advantage of the superior frictional qualities of cork alone. Strangely the specification of the patent points out no such virtue or action, and indeed the claims do not specify such protruding inserts. Figure 3, which indicates a slight elevation in the center of the inserts, is referred to as pointing out such protrusion. But on examination it would appear that in that relation it is incidental only to a compression of a cylindrical cork into a hole of the fabric, causing the cork to protrude slightly in the middle. The figure shows it likewise somewhat higher in the center of its opposite end, notwithstanding that in that exemplification there is a backing shown, indicating that the illustration is that of material for a driving belt. The specification mentions inserts with diameter somewhat larger at the end towards the band, inserted into a corresponding excision from the fabric. In such there is no material compression of the inserts, and there would be no protrusion. All the exemplifications shown in evidence indicate the inserts to be the frustrum of a cone, with the *119smaller surface protruding beyond the face of the fabric. We quite agree with the District Court that in the state of the art invention was not involved in the mere insertion of cork-in these strips; and even if a special function and virtue reside in the protrusion of the corks beyond the face of the strip, that feature is not covered by the patent.

Another advantage upon which some of the witnesses dilate is that in use the fabric is not so likely to shear off the cork as would be the case if it were inserted in a hard and perhaps unyielding substance. No mention of this quality or advantage is found in the specification, where, apart from the superior gripping effect afforded by the cork, the only advance over the prior art, which is pointed out, is the adaptability of the flexible body portion to any desired shape, so that it may be kept as a stock article, and, as wanted, cut in desired dimensions for any particular use. A patentee is entitled to the benefit of whatever merit his invention possesses, regardless of whether, at the time of the 'grant, it was pointed out' or he comprehended it. But this alleged advantage, if 'real, is bound up with the element of protrusion of the corks; for it is their protrusion from a hard, sharp, unyielding edge which might cause them to shear off. Where the inserts normally fill the excisions, and are therefore flush with the surrounding surface, no showing would be likely.

It was testified that with the corks the linings last much longer than without them. So far as attributable to the well-known qualities of cork, its influence in that respect would be obvious. But the protrusion of the inserts is influential also in their relation. While the corks alone are contacting with the drum, there is no wear on the fabric, and this would protect it from wear.so long as the corks do not wear down even with the fabric. • Besides, it was testified that appellants’ strip was woven to their order — heavier and better than any other such strip on the market — and was treated by a secret and superior process, all of which may be the main factor in its longevity.

Appellants urge their very considerable commercial success in the marketing of their cork insert strips as indicating its patentable novelty. While commercial success may be helpful in resolving doubt as to novelty and invention, its persuasiveness may be more or less diluted, when causes other than that of novelty of the article apparently and materially contribute to the success. Here there appears, not only the claimed better quality, but the evidence shows also a campaign of extensive and apparently judicious advertising, which, coupled with, doubtless, good business and merchandising methods, has unquestionably been very influential in making a market for this product, beginning when appellant became interested in it, 10 years after the patent grant. It is significant that considerable success has attended, also, its marketing of its plain strip without inserts, at prices very much higher than for other strips in the market.

We are of opinion that the District Court reached the proper conclusion in the case, and its decree is affirmed.