DONALD A FOSTER
Radio and Television Technicians in Middleboro, MA
License number
Massachusetts 8157
Expiration Date
Dec 31, 2014
Type
Master Technician
Address
Address
Middleboro, MA 02347
Personal information
See more information about DONALD A FOSTER at radaris.comName
Address
Phone
566 Bay Rd, Duxbury, MA 02332
55 Maple St, Attleboro, MA 02703
Professional information
See more information about DONALD A FOSTER at trustoria.com
Bubble Injection Dissolved Gas Measurement Method And Apparatus
Bubble Injection Dissolved Gas Measurement Method And Apparatus
US Patent:
4681601, Jul 21, 1987
Filed:
Dec 28, 1983
Appl. No.:
6/566230
Inventors:
Donald A. Foster - Lakeville MA
Assignee:
Polaroid Corporation - Cambridge MA
International Classification:
B01D 1900
US Classification:
55 18
Abstract:
A method and apparatus for indirectly measuring the percentage of dissolved gas in a process liquid by injecting bubbles of the same kind of gas of predetermined diameter into the liquid to be measured and then measuring gas bubble life or survival time. Bubble lifetime is directly related to dissolved gas percentage. A relatively long gas bubble lifetime would be indicative of a highly saturated or poorly degassed process liquid, whereas a relatively short bubble lifetime would be indicative of a low degree of saturation or a well degassed process liquid. In one embodiment, dissolved gas percentage is determined by placing a small quantity of the process liquid into a container, injecting a burst of gas bubbles, of predetermined size, into this quantity of liquid, and then measuring gas bubble lifetime. In another embodiment, a portion of the liquid being measured is continuously routed through a tube at a known constant flow rate. A continuous series of individual bubbles are then injected into the transparent tube, at a fairly constant rate, at or near the bottom thereof.
Precharged Web Coating Apparatus
Precharged Web Coating Apparatus
US Patent:
4457256, Jul 3, 1984
Filed:
Jan 5, 1981
Appl. No.:
6/222331
Inventors:
Semyon Kisler - Newton MA
Edwin A. Chirokas - Lexington MA
Donald A. Foster - Lakeville MA
Edwin A. Chirokas - Lexington MA
Donald A. Foster - Lakeville MA
Assignee:
Polaroid Corporation - Cambridge MA
International Classification:
B05B 502, B05C 502
US Classification:
118621
Abstract:
Improved electrostatically assisted coating apparatus for placing an electrostatic dipole-type charge, of a predetermined magnitude, on material to be coated before and/or remote from the location where the coating is actually applied to said material by a coating applicator.