# US 7,607,634 B2 · Shape memory polymer conduits and methods of use

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- Number: US 7,607,634 B2
- Document ID: US7607634B2
- Status: Granted
- Kind: B2
- Application number: 11/068,028
- Filed: 2005-02-28
- Published: 2005-09-15
- Granted: 2009-10-27
- Earliest claimed: 2004-03-12
- Assignees: GM Global Technology Operations LLC
- Inventors: Alan L. Browne; Norman K. Bucknor; Michael R. Leslie
- Web page: https://patentgrep.com/patent/US7607634B2

## CPC

- F16K 31/002: {actuated by temperature variation (thermo-electric F16K31/025)}
- F16K 7/02: with tubular diaphragm
- F01P 2007/143: {using restrictions}
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- Y10T 428/139: Open-ended, self-supporting conduit, cylinder, or tube-type article
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}
- F01P: COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES (arrangements in connection with cooling of propulsion units in vehicles B60K11/00; heat-transfer, heat-exchange or heat-storage materials C09K5/00; {cooling of gas-turbine engines F02C7/12}; heat exchange in general, radiators F28)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method comprises applying a thermal activation signal to a conduit comprising a shape memory polymer, causing a change in at least one property of the shape memory polymer, and regulating fluid flow through the conduit by the change in the at least one property of the shape memory polymer. A conduit comprises a shape memory polymer in an amount effective to regulate fluid flow through the conduit by a change in at least one property of the shape memory polymer caused by application of a thermal activation signal. The conduits and methods disclosed herein may find use as drinking utensils, respirator tubes, pump intake tubes, motor vehicle cooling system bypass hoses, motor vehicle engine oil filter bypass hoses, or motor vehicle powertrain fluid circulation hoses.

## Claims

### Claim 1

An intermediate conduit section formed of a single layer wall, presenting a first longitudinal profile and a first open cross-sectional flow area, and comprising a shape memory polymer in an amount effective to reconfigure the profile and area so as to present a second profile and open area and thereby regulate fluid flow through the conduit section, by a change in at least one property of the shape memory polymer caused by application of a thermal activation signal.

### Claim 2 (depends on 1)

The conduit section of claim 1, wherein the shape memory polymer comprises polyphosphazenes, poly(vinyl alcohols), polyamides, polyester amides, poly(amino acid)s, polyanhydrides, polycarbonates, polyacrylates, polyalkylenes, polyacrylamides, polyalkylene glycols, polyalkylene oxides, polyalkylene terephthalates, polyortho esters, polyvinyl ethers, polyvinyl esters, polyvinyl halides, polyesters, polylactides, polyglycolides, polysiloxanes, polyurethanes, polyethers, polyether amides, polyether esters, polystyrene, polypropylene, polyvinyl phenol, polyvinylpyrrolidone, chlorinated polybutylene, poly(octadecyl vinyl ether) ethylene vinyl acetate, polyethylene, poly(ethylene oxide)-poly(ethylene terephthalate), polyethylene/nylon (graft copolymer), polycaprolactones-polyamide (block copolymer), poly(caprolactone) dimethacrylate-n-butyl acrylate, poly(norbornyl-polyhedral oligomeric silsequioxane), polyvinyl chloride, urethane/butadiene copolymers, polyurethane block copolymers, styrene-butadiene-styrene block copolymers, and combinations comprising at least one of the foregoing.

### Claim 3 (depends on 1)

The conduit section of claim 1, wherein the change in at least one property comprises a change in elastic modulus, a shape, a dimension, a shape orientation, a phase of matter, or a combination comprising at least one of the foregoing properties.

### Claim 4 (depends on 1)

The conduit section of claim 1, wherein regulating fluid flow through the conduit section includes collapsing or expanding the conduit section.

### Claim 5

A drinking utensil including a cylindrical section presenting a first longitudinal profile and a first open cross-sectional flow area and comprising a shape memory polymer in an amount effective to reconfigure the profile and area so as to present a second profile and open area and thereby regulate flow of a drinkable fluid through the drinking utensil, by a change in at least one property of the shape memory polymer caused by application of a thermal activation signal.