ARTHUR F MCDONIE
Engineers in Lancaster, PA

4341427, Jul 27, 1982

Jun 30, 1980

6/164675

Charles M. Tomasetti - Leola PA
Maurice D. Harsh - Lancaster PA
Arthur F. McDonie - Lancaster PA

RCA Corporation - New York NY

H01J 912, H01J 900

316 1

A method is described for stabilizing the anode sensitivity of a photomultiplier tube having a photocathode, an anode, and a plurality of dynodes including at least one Nichrome dynode adjacent to the anode. The steps include differentially heating the tube so that the temperature of the Nichrome dynodes and the anode is substantially greater than the photocathode. The temperature gradient established by the differential heating redistributes alkali material from the surface of the dynodes in a beneficial manner so as to balance the secondary emission gain of the dynodes so that decrease in Nichrome dynode gain is offset by increases in the gain of the other dynodes. The tube is then bright aged at a first voltage followed by a dark age at a higher voltage. The aging steps rearrange or rebind the remaining loosely bound alkali material to provide an increase in anode sensitivity stability.

4593229, Jun 3, 1986

May 18, 1984

6/611873

Arthur F. McDonie - Lancaster PA
Donald B. Kaiser - Lancaster PA

RCA Corporation - Princeton NJ

H01J 4004, H01J 4306

313533

A photomultiplier tube comprises an evacuated envelope having a photoemissive cathode, a shield cup spaced from the cathode and an electron multiplier cage assembly abutting the shield cup. The cage assembly includes a pair of transversely spaced insulating support plates having oppositely disposed surfaces. A plurality of dynodes and an anode are disposed between the support plates. A plurality of oppositely disposed locating slots are formed in the shield cup. At least one tab slot is formed through the oppositely disposed surfaces of each of the support plates. A plurality of connecting tab members are provided for connecting the cage assembly to the shield cup. Each tab member includes a slot engaging portion, a locking portion, a locating portion and an attachment portion. The slot engaging portion is disposed within the tab slot of the support plate. The locking portion extends from one end of the slot engaging portion for securely engaging one surface of the plate.

4604545, Aug 5, 1986

Jul 28, 1980

6/172659

Arthur F. McDonie - Lancaster PA
Richard D. Faulkner - Lancaster PA

RCA Corporation - Princeton NJ

H01J 4300

313105CM

The photomultiplier tube comprises an evacuated envelope having therein a photocathode, an anode, a plurality of spaced apart dynodes for propagating and concatenating electron emission from the photocathode to the anode and a pair of substantially parallel support spacers of insulating material to support the dynodes and the anode. A chrome oxide layer is disposed on the support spacers adjacent to the dynodes and the anode. The chrome oxide layer has a resistance of at least about 10. sup. 12 ohms per square to about 10. sup. 15 ohms per square. A Nichrome coating overlies an inter-electrode region extending along the concatenating path of the electron emission from the dynodes to the anode. The Nichrome coating has a resistance of greater than 10. sup. 6 ohms per square but less than the resistance of the chrome oxide layer.

4446401, May 1, 1984

Nov 20, 1981

6/323287

Richard D. Faulkner - Lancaster PA
Daniel L. Thoman - Leola PA
Arthur F. McDonie - Lancaster PA

RCA Corporation - New York NY

H01J 4000

313533

A photomultiplier tube includes an evacuated envelope having therein a photocathode, an anode and an electron multiplier disposed between the cathode and the anode for propagating and concatenating electrons along a path therebetween. The electron multiplier and the anode are supported by a pair of oppositely-disposed support plates. At least one aperture which extends along at least a portion of the electron path is formed in each plate. A pair of focusing shields may be spaced from the exterior surface of each of the support plates. The focusing shields are disposed adjacent to the apertures in the support plates and extend longitudinally along the electron path to provide a transverse focusing field which prevents substantially all of the electrons from impinging on the interior surface of the support plates.

4570102, Feb 11, 1986

May 18, 1984

6/611753

Arthur F. McDonie - Lancaster PA
Donald B. Kaiser - Lancaster PA

RCA Corporation - Princeton NJ

H01J 4004, H01J 4326, H01J 1942

313533

A photomultiplier tube comprises an evacuated envelope having a photoemissive cathode, a shield cup spaced from the cathode and an electron multiplier cage assembly abutting the shield cup. The cage assembly includes a pair of transversely spaced support plates having a plurality of support slots formed therethrough. Each of the support plates has a distal end and a proximal end, with the proximal ends being attached to the shield cup. A light shield is disposed between the distal end of the support plates. An anode and a plurality of dynodes, at least one of which has a field mesh attached thereto, are disposed between the support plates and attached thereto by end tabs. The end tabs extend from the side of the anode and the dynodes. The aforementioned shield cup includes flaps which establish a minimum transverse spacing between the proximal ends of the support plates. The light shield has a transverse dimension substantially equal to that of the flaps to establish a minimum transverse spacing between the distal end of the support plates.

4339469, Jul 13, 1982

Jul 17, 1981

6/284258

Arthur F. McDonie - Lancaster PA
William K. Miller - Manheim PA

RCA Corporation - New York NY

B05D 134, B05D 138, B05D 302

427 10

A base layer comprised of antimony and oxygen is formed on a substrate within an evacuated enclosure. Rubidium, potassium and cesium are then evaporated onto the base layer after which the substrate is heated to promote an activating reaction between the rubidium, potassium, cesium and antimony.

4521715, Jun 4, 1985

Aug 30, 1982

6/412901

Richard D. Faulkner - Lancaster PA
Arthur F. McDonie - Lancaster PA

RCA Corporation - Princeton NJ

H01J 4006

313531

An electron tube having an evacuated envelope includes therein an insulating substrate with a photoemissive cathode thereon. The cathode comprises a plurality of discrete substantially isolated photoemissive regions. A plurality of spaced apart conductive strips are disposed on the substrate and interconnect each of the photoemissive regions.

4331701, May 25, 1982

Jan 28, 1981

6/229296

Arthur F. McDonie - Lancaster PA

RCA Corporation - New York NY

B05D 134, B05D 138, B05D 304

427 10

A film of either manganese or antimony is evaporated onto a substrate within an evacuated enclosure. Oxygen is introduced into the enclosure to oxidize the film. A layer of antimony is then deposited onto the oxidized film to a predetermined thickness measured by the transmission of light through the substrate. Rubidium and cesium are then evaporated onto the antimony layer after which the substrate is heated to promote an activating reaction between the rubidium, cesium and antimony. Photocathodes formed in this manner, without superficial oxidation, typically have sensitivities within the range of 80-130 microamperes per lumen.

4196257, Apr 1, 1980

Jul 20, 1978

5/926338

Ralph W. Engstrom - Lancaster PA
Arthur F. McDonie - Lancaster PA

RCA Corporation - New York NY

H01J 3906, H01J 114

428457

A photocathode is formed by depositing a film of tellurium on a conductive base and then sensitizing the tellurium with at least two different alkali metals such as cesium and potassium or sodium and potassium. The photocathode has high sensitivity in the ultraviolet region and is substantially insensitive to solar radiation through the earth's atmosphere. Such a photocathode is useful in "solar-blind" detectors.

4039887, Aug 2, 1977

Jun 4, 1975

5/583745

Arthur Frederick McDonie - Lancaster PA

RCA Corporation - New York NY

H01J 114, H01J 1906

313346R

A reflective type photocathode of a photomultiplier includes a porous antimony layer in overlay relation to a layer of solid antimony along a supporting substrate.