WILLIAM C MARSHALL
Medical Practice in Pittsburgh, PA
License number
Pennsylvania MD023306L
Category
Medicine
Type
Medical Physician and Surgeon
Address
Address
Pittsburgh, PA 15205
Personal information
See more information about WILLIAM C MARSHALL at radaris.comName
Address
Phone
510 Stevenson St, Sayre, PA 18840
48 Hunters Ln, Devon, PA 19333
45 N Market St APT 406, Lancaster, PA 17603
45 Tomahawk Claim Ln, Mc Donald, PA 15057
464 Lone Pine Rd APT 11, Washington, PA 15301
Professional information
Process Of Gas Enrichment With Porous Siliceous-Containing Material
US Patent:
4842620, Jun 27, 1989
Filed:
Dec 1, 1987
Appl. No.:
7/127150
Inventors:
Joseph J. Hammel - Pittsburgh PA
Walter J. Robertson - Aspinwall PA
William P. Marshall - Pittsburgh PA
Herbert W. Barch - Natrona Heights PA
Balbhadra Daas - Allison Park PA
Michael A. Smoot - Oakmont PA
Richard P. Beaver - Library PA
Walter J. Robertson - Aspinwall PA
William P. Marshall - Pittsburgh PA
Herbert W. Barch - Natrona Heights PA
Balbhadra Daas - Allison Park PA
Michael A. Smoot - Oakmont PA
Richard P. Beaver - Library PA
Assignee:
PPG Industries, Inc. - Pittsburgh PA
International Classification:
B01D 5322
US Classification:
55 16
Abstract:
A hollow, porous, silica-rich fiber, a process for producing same, and a process for enriching at least one gas from a gaseous mixture utilizing at least one fiber to result in gas separations with good permeability and good selectivity. The fiber is non-crystalline and has pore sizes having a range of 1 to around 50 Angstroms in diameter and a mean pore size of around less than 20 Angstroms in diameter and a filament diameter in the range of 1 to around 250 microns and a wall thickness in the range of around 1 to 50 microns. The fibers with a fine pore structure and thin walls are produced by forming hollow glass fibers hindered or fully phase-separable boron and/or alkali metal glass composition, by attenuation from melt at speeds in the range of 500 ft/min to around 30,000 ft/min. The phase-separable glass fibers are heat treated to yield limited phase-separated hollow glass fibers and these fibers are leached to extract acid and/or water soluble components. For fully phase-separable, hollow glass fibers, a limited heat treatment is used before leaching, where the heat treatment is at a temperature of around 300 to less than 480. degree. C.
Silica-Rich Porous Substrates With Reduced Tendencies For Breaking Or Cracking
US Patent:
4933307, Jun 12, 1990
Filed:
Apr 21, 1988
Appl. No.:
7/184304
Inventors:
William P. Marshall - Pittsburgh PA
Joseph J. Hammel - Pittsburgh PA
Herbert W. Barch - Natrona Heights PA
Roy D. Hegedus - Millvale PA
Walter J. Robertson - Aspinwall PA
Joseph J. Hammel - Pittsburgh PA
Herbert W. Barch - Natrona Heights PA
Roy D. Hegedus - Millvale PA
Walter J. Robertson - Aspinwall PA
Assignee:
PPG Industries, Inc. - Pittsburgh PA
International Classification:
C03C 1100, C03C 1200, C03C 1302
US Classification:
501 39
Abstract:
Porous, silica-rich shapes have improved strength and abrasion resistance by leaching the precursor glass shape in preconditioned acid having silica ion and at least one common ion that is also present in the precursor glass shape. The precursor glass shapes have shapes such as fibers, hollow fibers, tubes, rods, beads, hollow spheres and plates and compositions having 30-75 volume percent silica and at least 10-65 volume percent nonsiliceous acid extractable components. Preconditioning of the acid solution results from a pretreatment of the acid with compounds that dissociate into the ions when added to the acid solution or with shapes, particles or fragments of glass compositions different from or similar to the glass shape to be leached so long as the glass composition has extractable material to provide the silica ion and at least one common ion.
Method And Apparatus For Forming Hollow Fibers
US Patent:
4941904, Jul 17, 1990
Filed:
Jun 19, 1989
Appl. No.:
7/367908
Inventors:
Herbert W. Barch - Natrona Heights PA
William P. Marshall - Pittsburgh PA
William P. Marshall - Pittsburgh PA
Assignee:
PPG Industries, Inc. - Pittsburgh PA
International Classification:
C03B 37075
US Classification:
65 1
Abstract:
The instant invention relates to a method and apparatus for the production of hollow glass fibers using a novel tip design. It is believed that the success of the instant invention is due to the injection of pressurized gas to create a central lumen at distances farther removed from the terminus of the tip than taught possible by the prior art. This results in a more stable process and the production of hollow fibers having more uniform wall concentricity.