# US 8,771,330 B1 · Personal artificial transpiration cooling system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,330 B1 - Document ID: US8771330B1 - Status: Granted - Kind: B1 - Application number: 12/783,542 - Filed: 2010-05-19 - Granted: 2014-07-08 - Earliest claimed: 2010-05-19 - Assignees: HRL Laboratories, LLC - Applicants: Christopher S. Roper; William B. Carter - Inventors: Christopher S. Roper; William B. Carter - Web page: https://patentgrep.com/patent/US8771330B1 ## CPC - A61F 7/00: Heating or cooling appliances for medical or therapeutic treatment of the human body (hyperthermia using electric or magnetic fields or ultrasound A61N) - A61F 7/02: Compresses or poultices for effecting heating or cooling - A61F 2007/0065: {Causing evaporation} - A61F 2007/0068: {evaporating on the spot to be cooled} - A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C) ## Abstract A personal artificial transpiration cooling system having a transpiration surface with a substrate, a transpiration membrane layer which is spaced from the substrate layer by one or more spacers to define one or more interior fluid flow channels between a first surface of the transpiration membrane layer and the substrate; and a stoma layer disposed adjacent a second surface of the permeable membrane layer, the stoma layer being spaced from the second surface of permeable membrane layer by a predetermined distance to define one or more cavities disposed between pores in the at least one stoma layer and the second surface of the permeable membrane layer. A fluid reservoir is provided in fluid communication with the one or more interior fluid flow channels, while the transpiration surface is configured to be worn by a human or an animal and the fluid reservoir is designed to be supported, in use, by the human or animal wearing the transpiration surface. ## Claims ### Claim 1 A personal artificial transpiration cooling system comprising: a transpiration surface having a substrate, a permeable transpiration membrane layer which is spaced from the substrate by one or more spacers to define one or more interior fluid flow channels between a first surface of the permeable transpiration membrane layer and the substrate; and a stoma layer disposed adjacent a second surface of the permeable transpiration membrane layer, the stoma layer being spaced from the second surface of permeable transpiration membrane layer by a predetermined distance to define one or more cavities disposed between pores in the at least one stoma layer and the second surface of the permeable transpiration membrane layer; the transpiration surface being configured to be worn by a human or an animal. ### Claim 2 (depends on 1) The personal artificial transpiration cooling system of claim 1 wherein the permeable transpiration membrane layer comprises a hydrogel membrane. ### Claim 3 (depends on 1) The personal artificial transpiration cooling system of claim 1 wherein the stoma layer comprises a layer with an array of pores therein and wherein said stoma layer is preferably formed of a polymer material. ### Claim 4 (depends on 3) The personal artificial transpiration cooling system of claim 3 wherein the array of pores in at least one stoma layer have fixed pore sizes. ### Claim 5 (depends on 3) The personal artificial transpiration cooling system of claim 3 wherein the array of pores in at least one stoma layer have active pore sizes which change size in response to an external stimulus. ### Claim 6 (depends on 3) The personal artificial transpiration cooling system of claim 3 wherein the array of pores in at least one stoma layer have active pore sizes which change size in response to a change in the relative humidity to which the transpiration surface is exposed. ### Claim 7 (depends on 3) The personal artificial transpiration cooling system of claim 3 wherein the array of pores in at least one stoma layer have active pore sizes which change size in response to a change in an electrical control signal. ### Claim 8 (depends on 3) The personal artificial transpiration cooling system of claim 3 wherein the pores in the stoma layer are sized so that, in use, with a fluid filling the one or more interior fluid flow channels from a fluid reservoir, the pores which vent the one or more cavities to an ambient environment are sized so that vapor activity in the one or more cavities is greater than that required to avoid cavitation of the liquid in the one or more interior fluid flow channels. ### Claim 9 (depends on 8) The personal artificial transpiration cooling system of claim 8 further including a membrane for extracting pure water from bodily fluids used as a fluid source for said reservoir. ### Claim 10 (depends on 1) The personal artificial transpiration cooling system of claim 1 further including a fluid reservoir in fluid communication with said one or more interior fluid flow channels. ### Claim 11 (depends on 10) The personal artificial transpiration cooling system of claim 10 wherein the fluid reservoir is supported in use by the human or animal wearing the transpiration surface. ### Claim 12 (depends on 1) The personal artificial transpiration cooling system of claim 1 further including a heat pipe for conducing heat away from the human or animal wearer and towards said transpiration surface. ### Claim 13 (depends on 1) The personal artificial transpiration cooling system of claim 1 wherein at least a portion of said transpiration surface is double-sided with stoma located on each exterior major surface thereof. ### Claim 14 (depends on 1) A chemical and/or bio hazard suit comprising: (i) a personal artificial transpiration cooling system according to claim 1; and (ii) one or more layers of material for isolating the wearer from the wearer's surrounding environment, said one or more layers of material being disposed between the wearer and said personal artificial transpiration cooling system.