Xiaohong Aohong Yu

US Patent:

56432461, Jul 1, 1997

Filed:

Feb 24, 1995

Appl. No.:

8/393971

Inventors:

Steven B. Leeb - Belmont MA
E. C. Lupton - Boston MA
Xiaohong Yu - Boston MA
George Hovorka - Boston MA

Assignee:

Gel Sciences, Inc. - Bedford MA

International Classification:

A61K 922

US Classification:

6048901

Abstract:

A system for remotely inducing a phase transition in a gel is provided. The system includes a gel capable of volume change in response to an environmental stimulus, a seed material in contact with the gel, and generating a time-varying magnetic or a time-varying electric or electromagnetic field in the proximity of the gel to produce the environmental stimulus. In a preferred embodiment, the environmental stimulus is temperature.

US Patent:

58302077, Nov 3, 1998

Filed:

Jan 30, 1997

Appl. No.:

8/791368

Inventors:

Steven B. Leeb - Belmont MA
Elmer C. Lupton - Boston MA
Xiaohong Yu - Boston MA
George Hovorka - Boston MA

Assignee:

MedLogic Global Corporation - Colorado Springs CO

International Classification:

A61K 922

US Classification:

6048901

Abstract:

A system for remotely inducing a phase transition in a gel is provided. The system includes a gel capable of volume change in response to an environmental stimulus, a seed material in contact with the gel, and generating a time-varying magnetic or a time-varying electric or electromagnetic field in the proximity of the gel to produce the environmental stimulus. In a preferred embodiment, the environmental stimulus is temperature.

US Patent:

55651399, Oct 15, 1996

Filed:

Jun 2, 1995

Appl. No.:

8/459307

Inventors:

David H. Walker - Winchester MA
Harris Gold - Lexington MA
George W. McKinney - Chestnut Hill MA
John F. McCoy - North Chelmsford MA
Xiaohong Yu - Boston MA

Assignee:

Gel Sciences, Inc. - Bedford MA

International Classification:

B01D 5306
B01D 5308
B01D 5326

US Classification:

252194

Abstract:

A vapor extraction apparatus includes a gel sorbent capable of absorbing vapor directly into the liquid state and capable of disgorging the absorbed liquid in a phase-transition. The apparatus includes a housing adapted for movement from a first position, where it is exposed to a vapor-containing gas stream and a first environmental condition, and capable of moving to a second position, where it is exposed to a second environmental condition. A gel sorbent is disposed on at least one surface of the housing. The gel sorbs vapor from the gas stream as liquid when the sorbent is in its first position. The sorbent disgorges the liquid during phase-transition collapse when it is in the second position. A method of extracting vapor from a process gas stream includes contacting a phase transition gel sorbent with vapor under conditions sufficient for the gel sorbent to undergo a phase transition and absorb vapor as liquid inside the gel sorbent. The gel sorbent is then exposed to conditions sufficient for it to undergo a phase transition and disgorge the liquid from inside the gel sorbent.

US Patent:

55341861, Jul 9, 1996

Filed:

Dec 15, 1993

Appl. No.:

8/168723

Inventors:

David H. Walker - Winchester MA
Harris Gold - Lexington MA
George W. McKinney - Chestnut Hill MA
John F. McCoy - North Chelmsford MA
Xiaohong Yu - Boston MA

Assignee:

Gel Sciences, Inc. - Bedford MA

International Classification:

C02F 128

US Classification:

252194

Abstract:

A vapor extraction apparatus includes a gel sorbent capable of absorbing vapor directly into the liquid state and capable of disgorging the absorbed liquid in a phase-transition. The apparatus includes a housing adapted for movement from a first position, where it is exposed to a vapor-containing gas stream and a first environmental condition, and capable of moving to a second position, where it is exposed to a second environmental condition. A gel sorbent is disposed on at least one surface of the housing. The gel sorbs vapor from the gas stream as liquid when the sorbent is in its first position. The sorbent disgorges the liquid during phase-transition collapse when it is in the second position. A method of extracting vapor from a process gas stream includes contacting a phase transition gel sorbent with vapor under conditions sufficient for the gel sorbent to undergo a phase transition and absorb vapor as liquid inside the gel sorbent. The gel sorbent is then exposed to conditions sufficient for it to undergo a phase transition and disgorge the liquid from inside the gel sorbent.