Razmik L Akopyan

US Patent:

6984352, Jan 10, 2006

Filed:

May 29, 2002

Appl. No.:

10/157324

Inventors:

Razmik L. Akopyan - Olathe KS, US

International Classification:

B29C 33/40

US Classification:

264219, 4251748 R, 4251748 E

Abstract:

A mold for uniformly heating working material to form a workpiece using a microwave oven. Uniform heating of a workpiece of variable thickness may be obtainied in a microwave oven with a uniform electric field in its cavity if the mold material is selected to have a dielectric constant and a thermosensitivity equal to that of the working material. The thermosensitivity of a material is its dissipation factor divided by the product of its density and specific heat. Uniform heating of a uniformly thick workpiece can be obtained in a conventional microwave by selecting the mold material to have a relative thermosensitivity equal to that of the working material. The relative thermosensitivity of a material is its dissipation factor divided by the product of its dielectric constant, density, and specific heat.

US Patent:

7122146, Oct 17, 2006

Filed:

Apr 18, 2005

Appl. No.:

11/108523

Inventors:

Razmik L. Akopyan - Olathe KS, US

International Classification:

B29C 45/46
B29C 45/00

US Classification:

264478, 264489, 425174

Abstract:

Injection molding machine utilizes microwave heating. A microwave oven adapted to receive a microwave absorbent plasticizing vessel is utilized with or incorporated into an injection molding system to form a plasticizing unit for heating polymer granules to an injection temperature and injection of the melt into the cavity of the injection mold. The polymer granules may be preheated by conventional heating systems to a temperature at which the granules become microwave absorbent before heating to the injection temperature in the microwave oven. The injection molding machine also contains a hydraulic actuator for injection of the melt. The ceramic materials forming the plasticizing vessel are selected to provide equal heating rates of mold members and relatively uniform heating of polymer to desired injection temperature.

US Patent:

7223087, May 29, 2007

Filed:

Jun 15, 2004

Appl. No.:

10/868574

Inventors:

Razmik Akopyan - Olathe KS, US

International Classification:

B29C 35/08

US Classification:

425174, 2491141, 4251744

Abstract:

A mold for relatively uniform heating and molding of a work material to form a workpiece using a microwave oven, includes upper and lower mold members and a sidewall mold member. The mold members are formed from materials selected to have an approximately equal effective thermosensitivity. The effective thermosensitivity of work material is its dissipation factor divided by the product of its dielectric constant, density and specific heat. The effective thermosensitivity of the material of mold layer of each mold member is its dissipation factor divided by the product of its dielectric constant, density, and specific heat and multiplied by the fraction of the mass of its mold layer divided by the total mass of this mold member. A metal sleeve is formed on an inner surface of the sidewall mold member with microwave absorbing material formed on the outside thereof and inner surfaces of the end mold members may also be coated with metal or other highly thermally conductive and wear resistant material.

US Patent:

7846369, Dec 7, 2010

Filed:

Jul 30, 2007

Appl. No.:

11/830767

Inventors:

Razmik L. Akopyan - Olathe KS, US

International Classification:

B29C 45/56

US Classification:

264314, 2643287, 26432812

Abstract:

A displacement-injection molding system utilizes a plasticizing vessel with cylindrical heat transfer cores extending into the cavity of the plasticizing vessel to efficiently heat polymer granules to their injection temperature and a variable volume mold utilizing back pressure to maintain the injected polymer under pressure. A plunger for ejecting polymer from the plasticizing vessel incorporates openings for receiving the cylindrical cores. The plasticizing vessel is preferably sized to receive at least two shot sizes of polymer material to permit continuous heating of the granules of plastic material between shots as additional granules are added to replace the ejected material.

US Patent:

20030224082, Dec 4, 2003

Filed:

May 9, 2003

Appl. No.:

10/435315

Inventors:

Razmik Akopyan - Olathe KS, US

International Classification:

B29C035/08
B29B013/00

US Classification:

425/174400, 219/756000

Abstract:

A mold for uniform heating and molding of work material to form a workpiece of variable thickness using a microwave oven includes upper and lower mold members and a sidewall mold member. Metal inserts, with irregular inner surfaces defining a mold cavity, are positioned adjacent opposed planar surfaces of the upper and lower mold members. The mold members are formed from material selected to have an effective thermosensitivity equal to that of the work material. The effective thermosensitivity of work material is its dissipation factor divided by the product of its dielectric constant, density and specific heat multiplied by the fraction of the mass of work material divided by the total mass of work material and metal inserts. The effective thermosensitivity of the material of inner layer of mold member is its dissipation factor divided by the product of its dielectric constant, density, and specific heat and multiplied by the fraction of the mass of its inner mold layer divided by the total mass of this mold member.

US Patent:

20070235901, Oct 11, 2007

Filed:

Mar 29, 2006

Appl. No.:

11/391999

Inventors:

Razmik Akopyan - Olathe KS, US

International Classification:

B29C 45/00

US Classification:

264328100, 425544000

Abstract:

A displacement-injection molding system utilizes heating transfer elements extending into the cavity of a plasticizing vessel to decrease the time required to heat polymer granules to their injection temperature and a variable volume mold utilizing back pressure to maintain molten polymer injected into the mold under pressure to prevent the formation of voids or pores in the molded product. The heat transfer elements include cylindrical cores having electric heaters mounted therein. The ejection mechanism for ejecting molten polymer from the plasticizing vessel comprises a plunger having openings for receiving the cylindrical cores and passing thereacross.

US Patent:

62419293, Jun 5, 2001

Filed:

Jul 29, 1999

Appl. No.:

9/363601

Inventors:

Razmik L. Akopyan - Olathe KS

International Classification:

B29C 3340

US Classification:

264219

Abstract:

An RF heating apparatus and method utilizing a mold positioned between a pair of electrodes across which an RF field may be applied to heat working material in a cavity of the mold. The material used to form the mold is selected such that its dielectric constant and parameter of thermosensitivity to an RF field are equivalent the dielectric constant and parameter of thermosensitivity to an RF field of the working material to achieve relatively uniform heating of said working material to a selected temperature. The parameter of thermosensitivity to an RF field of a material generally comprises its power factor divided by the product of its density and specific heat, tan. delta. /c. rho.