WILLIAM M WAREHAM
Engineering in Marion, MA

4819487, Apr 11, 1989

May 28, 1987

7/054747

William Wareham - Marion MA

Dynisco, Inc. - Norwood MA

G01L 708, G01L 904

73726

A pressure transducer for in particular the measurement of relatively high pressures in the range of 10,000-50,000 psi and including an elongated frame having a capillary tube extending therethrough and employing a coupler at one end of the frame for sensing input pressure. A sensing member is provided disposed about the capillary tube at the other end of the frame and has, defined with the capillary tube, a sensing chamber in communication with the capillary tube. A recess is provided in the sensing member defining a relatively thin wall adjacent the annular sensing chamber. This wall has a pressure responsive sensing surface that extends substantially parallel to the capillary tube length and upon which strain gages are secured. A method as described for securing the capillary tube with the sensing member in a liquid tight manner.

4679438, Jul 14, 1987

Nov 14, 1985

6/798169

William Wareham - Marion MA

Dynisco, Inc. - Norwood MA

G01L 708, G01L 904

73726

A pressure transducer for in particular the measurement of relatively high pressures in the range of 10,000-50,000 psi and including an elongated frame having a capillary tube extending therethrough and employing a coupler at one end of the frame for sensing input pressure. A sensing member is provided disposed about the capillary tube at the other end of the frame and has, defined with the capillary tube, a sensing chamber in communication with the capillary tube. A recess is provided in the sensing member defining a relatively thin wall adjacent the annular sensing chamber. This wall has a pressure responsive sensing surface that extends substantially parallel to the capillary tube length and upon which strain gages are secured. A method as described for securing the capillary tube with the sensing member in a liquid tight manner.

5440932, Aug 15, 1995

Mar 24, 1994

8/217645

William Wareham - Marion MA

Dynisco, Inc. - Sharon MA

G01L 702

73730

A pressure transducer for an injection molding machine includes a housing coupled to a nozzle of an injection molding machine. A hollow stress tube, attached to the housing, through which molten material of the injection molding machine flows, bellows in response to pressure from the material. An outer ring having an opening is coupled to the stress tube such that the outer ring expands, causing displacement of the outer ring about the opening, when the stress tube bellows. A displacement sensor is included for determining the displacement of the outer ring about the opening. This displacement is directly proportional to the pressure of the material. In this manner, the pressure transducer determines the pressure of the molten material.

5360331, Nov 1, 1994

Jan 5, 1993

8/000632

William Wareham - Marion MA

Dynisco, Inc. - Sharon MA

B29C 4577, B29C 4578

425144

A pressure transducer for an injection molding machine includes a housing coupled to a nozzle of an injection molding machine. A hollow stress tube, attached to the housing, through which molten material of the injection molding machine flows, bellows in response to pressure from the material. An outer ring having an opening is coupled to the stress tube such that the outer ring expands, causing displacement of the outer ring about the opening, when the stress tube bellows. A displacement sensor is included for determining the displacement of the outer ring about the opening. This displacement is directly proportional to the pressure of the material. In this manner, the pressure transducer determines the pressure of the molten material.

5602339, Feb 11, 1997

Jun 29, 1995

8/496418

William Wareham - Marion MA

Dynisco, Inc. - Sharon MA

G01L 702

73730

An in-line pressure transducer includes a body and an inner ring, coupled to the body, through which molten material flows. The inner ring expands in response to pressure from the molten material. An outer ring is located coaxially with the inner ring. At least one flexure connects the inner and outer rings. The flexures translate expansion of the inner ring to the outer ring. The body includes a cavity within which the outer ring is located. The cavity preferably has a cross-sectional shape that is trapezoidal in order to compensate for lateral displacement of the transducer in response to axial forces exerted thereon during operation.

4680972, Jul 21, 1987

Jan 7, 1985

6/689385

William Wareham - Marion MA

Dynisco, Inc. - Norwood MA

G01L 704, G01L 904

73730

A pressure transducer for in particular the measurement of relatively high pressures in the range of 10,000-50,000 psi and including an elongated frame having a capillary tube extending therethrough and employing a coupler at one end of the frame for sensing input pressure. A sensing member is provided disposed about the capillary tube at the other end of the frame and has, defined with the capillary tube, a sensing chamber in communication with the capillary tube. A recess is provided in the sensing member defining a relatively thin wall adjacent the annular sensing chamber. This wall has a pressure responsive sensing surface that extends substantially parallel to the capillary tube length and upon which strain gages are secured.

4702113, Oct 27, 1987

Apr 4, 1986

6/848300

William Wareham - Marion MA

Dynisco, Inc. - Norwood MA

G01L 708, G01L 904

73706

A pressure transducer with a diaphragm coupler at one end and a sensing element at the other end connected by a capillary tube. The sensing element includes a cap member having a deformable surface including a top wall forming a thin diaphragm having a diametrically disposed raised beam extending across the top surface and having a gage receiving surface for receiving a plurality of strain gages.

4369659, Jan 25, 1983

Aug 11, 1980

6/176863

William M. Wareham - Marion MA

Bofors America, Inc. - Norwood MA

G01L 904, G01L 1904

73708

The melt pressure transducer is preferably for use in pressure measurements associated with an injection molding machine, and is designed to be mounted inside a mold to measure cavity pressure directly. In addition to being small in size, the transducer is also adapted for high cycle life. The transducer utilizes an internal filler rod for temperature compensation and, also, to reduce liquid volume rather than a capillary. The strain gauges are secured to opposing flats of the housing to provide a pressure-ranged section. The housing is in the form of a thick-walled cylinder with the flats forming the sensitive areas. Further, a unique fill and seal technique is described for charging the transducer and, at the same time, pre-stressing the coupling diaphragm.

4712430, Dec 15, 1987

Oct 14, 1986

6/918087

William Wareham - Marion MA

Dynisco, Inc. - Norwood MA

G01L 708, G01L 904

73706

A pressure transducer with a diaphragm coupler at one end and a sensing element at the other end connected by a capillary tube. The sensing element includes a cap member having a deformable surface including a top wall forming a thin diaphragm having a diametrically disposed raised beam extending across the top surface and having a gage received surface for receiving a plurality of strain gages. The deformable top wall surface has indentations therein on either side of and extending longtudinally of the raised beam to reduce tension forces across the diaphragm and improve linearity of the diaphragm.

4829827, May 16, 1989

May 27, 1987

7/054936

William Wareham - Marion MA

Dynisco, Inc. - Norwood MA

G01L 708, G01L 904

73726

A pressure transducer for the measurement of mid-range pressures in the preferred range of 500-7500 psi and including an elongated frame having a capillary tube extending therethrough and employing a coupler at one end of the frame for sensing input pressure. A sensing member is provided at the other end of the capillary tube and has a sensing chamber adapted to have at least one filler means disposed therein. A recess is provided in the sensing member defining a relatively thin wall adjacent the sensing chamber. This wall has a pressure responsive sensing surface that extends substantially parallel to the capillary tube length and upon which strain gages are secured.