1
Michael H Freeman: Multifocal contact lenses utilizing diffraction and refraction. Pilkington P E, F Eugene Davis IV, Mark P Stone, January 20, 1987: US04637697 (213 worldwide citation)

A bifocal contact lens has diffractive power added to the basic refractive power provided by the material of the lens and the basic curvature of its front and rear surfaces. The diffractive power arises from concentric zones, each providing an asymmetric retardation of light across the zone width to ...


2
Michael J Tuck: Display system having wide field of view. Pilkington P E, F Eugene Davis IV, September 20, 1988: US04772942 (166 worldwide citation)

A display system which can be used inside a vehicle such as a military tank to monitor at least part of the surrounding panorama. The display system has a display generator and an optical system for viewing the display. Electronic means are provided to predistort the display to compensate for distor ...


3
Michael H Freeman: Ophthalmic lens with diffractive power. Pilkington P E, F Eugene Davis IV, Mark P Stone, February 10, 1987: US04641934 (145 worldwide citation)

An ophthalmic lens incorporates a transmission hologram which has negative diffractive power and introduces positive longitudinal chromatic aberration to add to the natural longitudinal chromatic aberration of the human eye, thereby reducing the need to accommodate. The lens also has refractive powe ...


4
Michael H Freeman: Artificial eye lenses. Pilkington P E, F Eugene Davis IV, Mark P Stone, February 10, 1987: US04642112 (134 worldwide citation)

A contact lens has a transmission hologram which provides diffractive power on a wavelength and/or amplitude selective basis whereby light from near and distant objects can be focussed on the retina of a presbyopic wearer. Similarly an implant lens can have a transmission hologram to correct for non ...


5
Michael H Freeman: Ophthalmic lenses with diffractive power. Pilkington P E, F Eugene Davis IV, Mark P Stone, April 7, 1987: US04655565 (102 worldwide citation)

A contact or spectacle or implant lens has positive diffractive power which introduces negative longitudinal chromatic aberration that more than counteracts, and is preferably greater than twice, the natural positive longitudinal chromatic aberration of the eye. The residual negative longitudinal ch ...


6
David W Swift: Head-up displays. Pilkington P E, F Eugene Davis IV, August 16, 1983: US04398799 (72 worldwide citation)

In a head-up display system by which visual information from a display is superimposed by means of a combiner on a pilot's view of the outside scene, the pilot's view is recorded by a head mounted camera to which light from the outside scene and superimposed display is reflected by a head-mounted mi ...


7
Michael H Freeman: Optical apparatus. Pilkington P E, F Eugene Davis IV, March 30, 1982: US04322135 (56 worldwide citation)

Optical apparatus for biocular viewing which is small and of light weight comprises a solid optical element having a face which internally reflects light from an image surface to internally concave reflecting areas which reflect the light back to the face to emerge as two beams travelling towards re ...


8
Cedric A Kitchen: Intruder detection security system. Pilkington P E, F Eugene Davis IV, August 16, 1983: US04399430 (47 worldwide citation)

A security system having a mesh-like intruder detection structure for use as or with a security fence 2 or for detecting intruders jumping down from a fence or wall. The structure is made up from a number of elongated members (4, 6, 8, 10, 12, 14) each in the form of or including a fibre-optic waveg ...


9
David W Swift: Head-up displays. Pilkington P E, Mattern Ware Davis & Stoltz, May 8, 1979: US04153913 (42 worldwide citation)

This invention provides a head up display apparatus particularly for use by the pilot of an aircraft including a cathode ray tube to display visual information to the pilot, means for mounting the cathode ray tube on the head of the pilot and a combiner also mounted on the pilot's head to superimpos ...


10
Phillip J Rogers: Modified Petzval lens. Pilkington P E, Mattern Ware Davis & Stoltz, November 11, 1980: US04232943 (40 worldwide citation)

A collimating magnifier lens which may be used in a head-up display has a focal length of F. The lens has a front part comprising at least one positive element with a focal length between +1 F and +3 F and a negative element with a focal length between -1.2 F and infinity, the focal length of the fr ...