Metal founding – Process – Shaping liquid metal against a forming surface
Reexamination Certificate
2007-12-04
2007-12-04
Johnson, Jonathan (Department: 1725)
Metal founding
Process
Shaping liquid metal against a forming surface
C164S034000, C164S516000, C164S488000
Reexamination Certificate
active
11536149
ABSTRACT:
Techniques for forming cast parts for medical devices suitable for contact with internal regions of patients are described herein. Such parts can be small in scale (e.g., having a major axis less than 0.3 inches, and/or a minor axis less than about 0.08 inches), and can be formed from metals that have a high melting point and high reactivity with environmental components or mold surfaces, such as stainless steel and titanium alloys. Such techniques can include injecting molten metal into the sprue of a mold tree such that the side runners are backfilled after the molten metal impacts a closed end of the sprue. Side runners can be oriented in particular directions and positions to promote backfilling. As well, flask temperatures and the use of surfactants can also promote cast part formation, hindering the formation of surface defects.
REFERENCES:
patent: 5564492 (1996-10-01), Preiss
patent: 5799386 (1998-09-01), Ingersoll et al.
patent: 5906234 (1999-05-01), Mastrorio et al.
patent: 5927379 (1999-07-01), Yasrebi et al.
patent: 5976457 (1999-11-01), Amaya et al.
patent: 6705385 (2004-03-01), Ray et al.
patent: 6755239 (2004-06-01), Ray et al.
patent: 6759134 (2004-07-01), Rosenberg
patent: 6776214 (2004-08-01), Ray et al.
patent: 6786984 (2004-09-01), Hanada et al.
patent: 6799626 (2004-10-01), Ray et al.
patent: 6799627 (2004-10-01), Ray et al.
patent: 6846369 (2005-01-01), Clark et al.
patent: 6848497 (2005-02-01), Sale et al.
patent: 6986381 (2006-01-01), Ray et al.
patent: 7025109 (2006-04-01), Ward et al.
Atwood, Clinton L., “Metal Casting Applications,” JTEC/WTEC Panel Report on Rapid Prototyping in Europe and Japan, v.1, ch.10 (1997).
Michael Black's Casting Manual, “The Basics of Paleoanthropological Casting,” ch.3.
Hendricks, M., “Binder Additive Research Results: A New Drying Agent is Claimed to Eliminate Drying Related Defects Without Compromising Slurry Life,” Foundry Trade J. (Mar. 2002).
“Investment Casting,” efunda engineering fundamentals, www.efunda.com.
Crawford William A.
DeForce Brain S.
Heaney Donald F.
Onukuri Samardh
Potter Tracy J.
Ethicon Endo-Surgery Inc.
Johnson Jonathan
Lin I.-H.
Nutter & McClennen & Fish LLP
LandOfFree
Cast parts with improved surface properties and methods for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cast parts with improved surface properties and methods for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cast parts with improved surface properties and methods for... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3841085