# US 8,539,715 B2 · RFID pet door > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,539,715 B2 - Document ID: US8539715B2 - Status: Granted - Kind: B2 - Application number: 13/546,821 - Filed: 2012-07-11 - Published: 2012-11-01 - Granted: 2013-09-24 - Earliest claimed: 2006-10-03 - Applicants: Nicholas Patrick Roland Hill - Inventors: Nicholas Patrick Roland Hill - Web page: https://patentgrep.com/patent/US8539715B2 ## CPC - G07C 9/28: the pass enabling tracking or indicating presence - E06B 7/32: Serving doors; Passing-through doors {; Pet-doors} - G07C 9/00896: {specially adapted for particular uses} - G07C 2009/00793: {by Hertzian waves} - Y10T 70/5199: Swinging door - G07C: TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE - E06B: FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Embodiments of the invention relate to the field of pet doors, particularly selective entry pet doors based on detection of RFID tags. An RFID pet door, the pet door comprising: an RFID reader to read an RFID tag on a pet; and a lock coupled to said RFID reader to control access through said pet door in response to an RFID signal from said tag; wherein said RFID reader has two modes, a first operational mode and a second, reduced power mode, and wherein said pet door further comprises: a pet proximity detector coupled to said RFID reader to identify when a pet is proximate said pet door and to control said RFID reader responsive to said identification such that when said pet is proximate said RFID is in said operational mode and such that said RFID reader is otherwise in said reduced power mode. ## Claims ### Claim 1 A radio frequency identification pet door, the pet door comprising: an RFID reader to read an RFID tag on a pet; a lock, coupled to said RFID reader, to control access through said pet door in response to an RFID signal from said RFID tag; wherein said RFID reader is able to read a pet identification code from both: i) a sub-dermal RFID tag; and ii) a collar-mounted RFID tag; and wherein a given pet has a collar-mounted RFID tag and a sub-dermal RFID tag; wherein said lock is controlled to selectively allow access of a pet with a said sub-dermal RFID tag, a pet with a collar-mounted RFID tag and said given pet with both said collar-mounted RFID tag and said sub-dermal RFID tag through said pet door responsive to a respective said pet-identification code read from the RFID tags; and wherein said sub-dermal RFID tag operates at a first frequency said collar-mounted RFID tag operates at a second, different frequency; wherein said first frequency is in the range of 125 KHz to 134 KHz; wherein said RFID reader has an RF communications bandwidth spanning both first and second frequencies; said RFID pet door further comprising: a frame mounting a moveable flap, wherein opening of said moveable flap is controlled by said lock; a tunnel attachment to said frame; and an antenna of said RFID reader mounted on or adjacent said tunnel; wherein said tunnel extends away from said moveable flap. ### Claim 2 (depends on 1) An RFID pet door as claimed in claim 1 configured to be mounted such that said tunnel extends away from said moveable flap towards an exterior side of a door or wall on which it is mounted. ### Claim 3 (depends on 2) An RFID pet door as claimed in claim 2 wherein said lock is configured to selectively inhibit opening of said flap in a direction away from said tunnel. ### Claim 4 (depends on 1) An RFID pet door as claimed in claim 1 wherein said antenna is disposed around said tunnel. ### Claim 5 (depends on 1) An RFID pet door as claimed in claim 1 further comprising a pet proximity detector to control said RFID reader into an operational mode on detection that said pet is proximate said pet door. ### Claim 6 (depends on 1) An RFID pet door as claimed in claim 1, wherein said sub-dermal chip has a lower coupling constant to said RFID reader than said collar-mounted RFID tag, such that said RFID reader can detect said collar-mounted tag RFID when said sub-dermal chip is in misalignment or out of resonance with said RFID reader. ### Claim 7 (depends on 6) An RFID pet door as claimed in claim 6, in combination with said collar-mounted RFID tag, and wherein said collar-mounted RFID tag is in combination with a metal pet identity tag which alters RF properties of said collar-mounted RFID tag. ### Claim 8 A method of controlling access of a pet through a pet door, the method comprising: providing a radio frequency identification reader able to read an tag over a plurality of different frequencies; detecting a sub-dermal RFID tag in a first said pet at a first frequency using said RFID reader; controlling a lock of said pet door using said RFID reader to control access of said first pet through said pet door; detecting a collar-mounted RFID tag on a second said pet at a second frequency using said RFID reader; controlling said lock of said pet door using said RFID reader to control access of said second pet through said pet door; detecting both a collar-mounted RFID tag and a sub-dermal RFID tag on a third said pet at a second frequency using said RFID reader; and controlling said lock of said pet door using said RFID reader to control access of said third pet through said pet door. ### Claim 9 (depends on 8) A method as claimed in claim 8 wherein said first frequency is between 125 KHz and 134 KHz. ### Claim 10 (depends on 8) A method as claimed in claim 8 further comprising mounting said collar-mounted RFID tag on or adjacent to a metal identity tag of said second pet such that said metal identity tag changes one or both of a resonant frequency of said collar-mounted RFID tag and a quality factor of said collar-mounted RFID tag. ### Claim 11 (depends on 10) A method as claimed in claim 10 further comprising adjusting a composition of said metal identity tag to reduce said change in resonant frequency of said collar-mounted RFID tag.