CA2443452A1 - Rolling code security system - Google Patents

Rolling code security system Download PDF

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Publication number
CA2443452A1
CA2443452A1 CA002443452A CA2443452A CA2443452A1 CA 2443452 A1 CA2443452 A1 CA 2443452A1 CA 002443452 A CA002443452 A CA 002443452A CA 2443452 A CA2443452 A CA 2443452A CA 2443452 A1 CA2443452 A1 CA 2443452A1
Authority
CA
Canada
Prior art keywords
rolling code
code
rolling
security system
fixed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002443452A
Other languages
French (fr)
Other versions
CA2443452C (en
Inventor
Bradford L. Farris
James J. Fitzgibbon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chamberlain Group Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority claimed from CA002193846A external-priority patent/CA2193846C/en
Publication of CA2443452A1 publication Critical patent/CA2443452A1/en
Application granted granted Critical
Publication of CA2443452C publication Critical patent/CA2443452C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Lock And Its Accessories (AREA)
  • Selective Calling Equipment (AREA)

Abstract

A rolling code transmitter is useful in a security system for providing secure encrypted RF transmission comprising an interleaved trinary bit fixed code and rolling code. A receiver demodulates the encrypted RF transmission and recovers the fixed code and rolling code. Upon comparison of the fixed and rolling codes with stored codes and determining that the signal has emanated from an authorized transmitter, a signal is generated to actuate an electric motor to open or close a movable barrier.
CA 2443452 1995-05-17 1996-05-16 Rolling code security system Expired - Lifetime CA2443452C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US44688695A 1995-05-17 1995-05-17
US446,886 1995-05-17
CA002193846A CA2193846C (en) 1995-05-17 1996-05-16 Rolling code security system

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002193846A Division CA2193846C (en) 1995-05-17 1996-05-16 Rolling code security system

Publications (2)

Publication Number Publication Date
CA2443452A1 true CA2443452A1 (en) 1996-11-21
CA2443452C CA2443452C (en) 2008-07-29

Family

ID=29550701

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2443452 Expired - Lifetime CA2443452C (en) 1995-05-17 1996-05-16 Rolling code security system

Country Status (1)

Country Link
CA (1) CA2443452C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111837165A (en) * 2017-12-21 2020-10-27 钱姆伯林集团公司 Safety system for movable barrier operator

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8422667B2 (en) 2005-01-27 2013-04-16 The Chamberlain Group, Inc. Method and apparatus to facilitate transmission of an encrypted rolling code
USRE48433E1 (en) 2005-01-27 2021-02-09 The Chamberlain Group, Inc. Method and apparatus to facilitate transmission of an encrypted rolling code
US9148409B2 (en) 2005-06-30 2015-09-29 The Chamberlain Group, Inc. Method and apparatus to facilitate message transmission and reception using different transmission characteristics
US11074773B1 (en) 2018-06-27 2021-07-27 The Chamberlain Group, Inc. Network-based control of movable barrier operators for autonomous vehicles
WO2020028502A1 (en) 2018-08-01 2020-02-06 The Chamberlain Group, Inc. Movable barrier operator and transmitter pairing over a network
US10997810B2 (en) 2019-05-16 2021-05-04 The Chamberlain Group, Inc. In-vehicle transmitter training

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111837165A (en) * 2017-12-21 2020-10-27 钱姆伯林集团公司 Safety system for movable barrier operator
CN111837165B (en) * 2017-12-21 2024-03-19 钱姆伯林集团有限责任公司 Safety system for movable barrier operator

Also Published As

Publication number Publication date
CA2443452C (en) 2008-07-29

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EEER Examination request
MKEX Expiry

Effective date: 20160516