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Primary Examiner: Adee, John
Assistant Examiner: Spitzer, Robert H.
Attorney: Gardner and Anten

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Title: Process of manufacturing a porous, stainless steel filter element and sealing it in a tubular fitting, and resulting filter

Abstract: An improved filter for medical infusion and injection equipment is manufactured by compacting stainless steel powder particles of an irregular or dendritic shape, in the substantial absence of a binder, to form a porous, self-supporting green article, and thereafter sintering the green article. The resulting filter is porous with the pores communicating with one another to form a network of tortuous or winding paths having lateral, oblique and vertical segments which function to trap contaminating particles of a solution passed therethrough. The porous filter is sealed in a tubular fitting by force-fitting the filter into the internal peripheral wall of an annular plastic bead in the fitting and heating the filter to cause the plastic bead to soften or melt and flow into the pores of the filter along a continuous peripheral ring.

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Inventors: Weichselbaum, Theodore E. (Normandy, MO, US)
Gusky, William W. (Florissant, MO, US)

Application Number: 354309
Filing Date: 1973-04-25
Publication_date: 1976-01-20
Assignee: Sherwood Medical Industries Inc. (St. Louis, MO)
Primary Class(es): 210/446 75/230, 75/246, 210/451, 210/503, 210/510.1, 264/125, 419/2, 419/36, 428/545, 428/613
Other Classes:
US Patent Ref:

1051814	Jan, 1913	Lowendahl	75/222.
1974173	Sep, 1934	Calkins	75/222.
2239800	Apr, 1941	Vogt et al.	75/222.
2297817	Oct, 1942	Truxel, Jr. et al.	210/510.
2540233	Feb, 1951	Beaver	210/510.
2554343	May, 1951	Pall	75/222.
2857913	Oct, 1958	Miskel	128/221.
2864366	Dec, 1958	Miskel	128/221.
2902363	Sep, 1959	Joyner	75/222.
3121685	Feb, 1964	Hazell	210/496.
3539472	Nov, 1970	Findeisen	264/111.
3722697	Mar, 1973	Burke et al.	128/214.
3788486	Jan, 1974	Bergstrom	210/510.
3817389	Jun, 1974	Weichselbaum	210/448.

Other Refs: Other References: "Stainless Steel", The Mining Magazine (London), Vol. 77, Oct. 1947, p. 207.
"Presses and Processes for Metal Powder Products", 4/17/44, The Electrochemical Society, pp. 137-160.