Mary Ann Hoffman

Author:

Mary Hoffman

ISBN #:

0140376011

Author:

Mary Hoffman

ISBN #:

0140556672

Author:

Mary Hoffman

ISBN #:

0142300225

Author:

Mary Hoffman

ISBN #:

0195205960

Author:

Mary Hoffman

ISBN #:

0382093232

Author:

Mary Hoffman

ISBN #:

0382093240

Author:

Mary Hoffman

ISBN #:

0382093259

Author:

Mary Hoffman

ISBN #:

0382093267

US Patent:

46459693, Feb 24, 1987

Filed:

Aug 1, 1980

Appl. No.:

6/174623

Inventors:

Mary V. Hoffman - South Euclid OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 162
H01J 6304

US Classification:

313487

Abstract:

A skin tanning lamp construction of a fluorescent type utilizing a combination of two different phosphors to provide efficient artificial skin tanning along with improved color rendition. The particular phosphor combination can be utilized as a blended mixture having a sufficient level of a phosphor constituent to impart some visible radiation in the red color region to the composite lamp emission.

US Patent:

47514264, Jun 14, 1988

Filed:

Nov 10, 1986

Appl. No.:

6/929130

Inventors:

Mary V. Hoffman - Cleveland Heights OH
Gustino J. Lanese - Chesterland OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 162
H01J 6304

US Classification:

313487

Abstract:

A fluorescent lamp utilizing a dual layer phosphor coating is disclosed wherein the base layer utilizes a first phosphor mixture and the top phosphor layer in said coating comprises a blend of narrow bandwith emitting phosphors to improve the color rendering capability of these lamps.

US Patent:

48475335, Jul 11, 1989

Filed:

Nov 30, 1987

Appl. No.:

7/126317

Inventors:

Mary V. Hoffman - South Euclid OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 162

US Classification:

313487

Abstract:

A low pressure mercury discharge fluorescent lamp is disclosed utilizing a particular phosphor blend deposited on a calcium haloapatite phosphor base layer to achieve white color lamp illumination efficiently with improved color rendition. The surface phosphor layer is a blended mixture of a first phosphor which is divalent europium barium and/or strontium magnesium aluminate having a hexagonal crystalline structure and which further includes coactivation by divalent manganese ion sufficient to produce substantial green color emission with a second phosphor which is trivalent europium activated rare earth oxide having a rare earth ion selected from yttrium, gadolinium and lutetium, including mixtures of these rare earth ions. The underlying calcium haloapatite layer also exhibits emission at approximately the same color point as achieved with the surface phosphor layer.

US Patent:

46238166, Nov 18, 1986

Filed:

Apr 22, 1985

Appl. No.:

6/726196

Inventors:

Mary V. Hoffman - South Euclid OH
John Paynter - Painesville OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 163
H01J 6144

US Classification:

313487

Abstract:

A fluorescent lamp utilizing a dual phosphor layer coating is disclosed producing efficient white color illumination at a lower cost than conventional phosphor coatings of the same type. The base layer in the phosphor coating comprises a conventional calcium haloapatite phosphor whereas the top phosphor layer comprises a tri-phosphor blend including a lanthanum cerium orthophosphate phosphor activated with terbium ion as the green color component along with a modified europium-activated yttrium oxide phosphor as the red color component.

US Patent:

48068241, Feb 21, 1989

Filed:

Mar 2, 1988

Appl. No.:

7/166739

Inventors:

John Paynter - Painesville OH
George R. Gillooly - Cleveland Heights OH
Thomas F. Soules - Richmond Heights OH
Mary V. Hoffman - South Euclid OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 6304

US Classification:

313486

Abstract:

A fluorescent lamp utilizing a dual layer phosphor coating is disclosed and with the base layer employing a calcium halophosphate phosphor which has been modified to provide efficient lumen output at a substantially reduced coating weight. The top phosphor layer in said coating comprises a blend of narrow bandwith emitting phosphors at various coating weights primarily to improve the color rendering capability of these lamps.

US Patent:

40342573, Jul 5, 1977

Filed:

Jun 5, 1975

Appl. No.:

5/583959

Inventors:

Mary V. Hoffman - South Euclid OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 162

US Classification:

313487

Abstract:

Color correction is provided in a high-pressure mercury vapor discharge lamp with a particular combination of two different phosphor materials producing an efficient composite emission. A blend of said phospor materials can improve color rendition without effecting any significant reduction in the lamp lumen output.