In re Land

109 F.2d 246, 27 C.C.P.A. 863, 44 U.S.P.Q. (BNA) 352, 1940 CCPA LEXIS 39
Court of Customs and Patent Appeals·Decided February 5, 1940·No. No. 4240·Published·Cited by 6 cases

Opinion

Bland, Judge,

delivered the opinion of the court:

Claims numbered 3, 8, 12, 13, 14, 15, 18, 21, 22, 23, 24, 25, and 26 in appellant’s application for a patent for “Improvements in Systems Employing Polarized Light for the Elimination of Headlight Glare” were rejected by the Primary Examiner of the United States Patent Office and his decision so rejecting them was affirmed by the Board of Appeals. From the decision of the latter, appeal has been taken here.

[864] The instant appeal involves subject matter closely related to that in companion appeal No. 4241 which was argued with the instant appeal. In the argument, appellant’s counsel conceded that the issues raised in considering claims 22, 23, 24, 25, and 26 were similar to the issues raised in the companion appeal No. 4241 and that if the court affirmed the decision of the board in that appeal as to the claims there involved, it likewise should affirm the decision of the board as to said claims 22 to 26, inclusive, involved in this appeal. In the said companion appeal, decided concurrently herewith, In re Land, 27 C. C. P. A. (Patents) 869, 109 F. (2d) 251, we affirmed the decision of the board in the rejection of the claims there involved. This leaves for consideration here claims 3, 8, 12, 13,14, 15, 18, and 21. Of these, claims 3, 12, and 15 are regarded as illustrative and follow :

3. An automobile headlight or the like comprising a light source, a reflector, and means, comprising a suspension of optically oriented birefringent particles in a light transmitting medium having an index of refraction for light vibrating in a predetermined direction matching substantially the index of said particles for said vibrations, interposed in the path of light rays reflected therefrom and adapted to transmit a portion of every ray traversing said means so as to provide a substantially specular non-diffused beam to form the hot spot and adapted to transmit the remaining portion of every such ray in a manner to provide a horizontally diffused beam so. propagated as to illuminate the roadway on each side of the hot spot.
12. In an automobile headlight or the like, a sheet-like suspension of oriented, needle-like, birefringent particles in an isotropic medium, the index of refraction of which matches one of the indices of refraction of the particles, said sheet-like suspension being adapted to resolve the rays emitted by said headlight into two components, one a substantially specular, non-diffused, plane-polarized beam vibrating in a direction at right angles to the direction of orientation of the needle axes of said crystals, and the other a beam diffused in the direction of vibration of said first-mentioned beam, the orientation of said crystals being such that said diffused beam is diffused in a substantially horizontal direction only.
15. In combination, a headlight for automotive vehicles and the like comprising means comprising a suspension of needle-like birefringent particles in a transparent medium having an index of refraction matching the index of said particles for light vibrating in a predetermined direction, said suspension being adapted with a light source and a reflector to project a substantially non-diffused, polarized beam of light comprising a portion of all rays reflected from said reflector and transmitted by said suspension for forming the hot spot, and adapted to transmit a horizontally diffused beam comprising the remaining portion of each of said rays for illuminating the sides of the roadway, and a viewing visor comprising a light-polarizing element positioned to substantially block so much of the beam forming the hot spot as impinges thereon.

The references relied upon are:

Short, 1,733,915, October 29, 1929
Cooke (Br.), 365,082, January 13,1932
Land, 2,031,045, February 18,1936

[865] Claims 3, 8, 15, 18, and 21 were rejected as being drawn to an old combination of elements disclosed by either Land or Short. Claims 12, 13, and 11 were rejected as being unpatentable over the claims in applicant’s copending application 72,501 (which matured into patent No. 2,123,901 on July 19,1938) in view of the British patent to Cooke. In view of the concession hereinbefore stated as to claims 22 to 26, inclusive, the two groups of claims last above, referred to are the only ones which require'consideration and discussion here. As to these two groups of claims, the Board of Appeals agreed with the examiner on their rejection and the grounds therefor.

The alleged invention is described and the relation of the applications with which we are here concerned is aptly stated in the decision of the board. We quote:

The claims on appeal are directed to an automobile headlight or to a system of illumination intended for use with automobiles, which involves the use on the headlight of a polarizing screen of such a character that the rays of light from .a suitable source, directed to the polarizing screen by a suitable reflector, will be polarized and thus divided into two beams, one of which may be projected forwardly along the road as a substantially specular, lion-diffused beam and the other of which will be horizontally diffused so as to illuminate the roadway at each side of the area illuminated by the beam first referred to.
In the application as filed several different expedients for producing polarized light of the character referred to have been disclosed. The preferred arrangement involves the use of birefringent crystals disposed in a suspending medium of isotropic form and having an index of refraction corresponding to that of one of the indices of the crystals. When such a combination is used, horizontal diffusion may be produced if the crystals be needle- or rod-shaped and they be oriented vertically as set forth in the paragraph beginning in line 23, page 7 of the brief. In using a headlight equipped with polarizing means such as above described, other automobiles should be equipped with a viewing screen which will exclude a part, at least, of the polarized light, preferably the specular beam which forms the hot spot projected by the headlight.
This application is a continuation-in-part of application No. 72,501, which has now become patent No. 2,123,901. In the patent a polarizing screen such as is here employed is described and claimed, but without reference to any particular use. The patent discloses its utility for automobile lighting- systems, hut no claim to-this particular rise appears in the patent.
A related patent, 2,123,902, shows a similar screen and also contains claims to a light polarizer which might be used in the system of the present application but, as in the case first discussed, the claims of the xiatent are not directed to any particular use.

As to tlie first group of claims — 3, 8, 15, 18, and 21 — which were rejected as being drawn to an old combination of elements disclosed by either Land or Short, the examiner stated:

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In re Land, 109 F.2d 246, 27 C.C.P.A. 863, 44 U.S.P.Q. (BNA) 352, 1940 CCPA LEXIS 39 (ccpa 1940).

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