GB2308457A - Monitoring of covert marks - Google Patents

Monitoring of covert marks

Info

Publication number
GB2308457A
GB2308457A GB9702716A GB9702716A GB2308457A GB 2308457 A GB2308457 A GB 2308457A GB 9702716 A GB9702716 A GB 9702716A GB 9702716 A GB9702716 A GB 9702716A GB 2308457 A GB2308457 A GB 2308457A
Authority
GB
United Kingdom
Prior art keywords
monitoring
covert marks
imagewise distribution
covert
polarised
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.)
Withdrawn
Application number
GB9702716A
Other versions
GB9702716D0 (en
Inventor
Richard Mark Farrar
Barry Hood
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.)
SLS Biophile Ltd
Original Assignee
SLS Biophile Ltd
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
Priority claimed from GBGB9515948.9A external-priority patent/GB9515948D0/en
Priority claimed from GBGB9517401.7A external-priority patent/GB9517401D0/en
Application filed by SLS Biophile Ltd filed Critical SLS Biophile Ltd
Priority to GB9702716A priority Critical patent/GB2308457A/en
Priority claimed from PCT/GB1996/001898 external-priority patent/WO1997006016A1/en
Publication of GB9702716D0 publication Critical patent/GB9702716D0/en
Publication of GB2308457A publication Critical patent/GB2308457A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/02—Pyrography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
    • B44B7/00—Machines, apparatus or hand tools for branding, e.g. using radiant energy such as laser beams
    • B44B7/002—Machines, apparatus or hand tools for branding, e.g. using radiant energy such as laser beams in layered material

Landscapes

  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

A method and apparatus for monitoring a body having a reflective surface (1), a coating layer (2) of material transparent to visible light present on the surface (1) and producing a covert optical discontinuity in an imagewise distribution on the layer (2); the imagewise distribution is such that it is visible via polarised light (7) and viewing through a polarised filter (8).
GB9702716A 1995-08-03 1996-08-05 Monitoring of covert marks Withdrawn GB2308457A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9702716A GB2308457A (en) 1995-08-03 1996-08-05 Monitoring of covert marks

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GBGB9515948.9A GB9515948D0 (en) 1995-08-03 1995-08-03 Marking
GBGB9517401.7A GB9517401D0 (en) 1995-08-24 1995-08-24 Marking
PCT/GB1996/001898 WO1997006016A1 (en) 1995-08-03 1996-08-05 Monitoring of covert marks
GB9702716A GB2308457A (en) 1995-08-03 1996-08-05 Monitoring of covert marks

Publications (2)

Publication Number Publication Date
GB9702716D0 GB9702716D0 (en) 1997-04-02
GB2308457A true GB2308457A (en) 1997-06-25

Family

ID=27267840

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9702716A Withdrawn GB2308457A (en) 1995-08-03 1996-08-05 Monitoring of covert marks

Country Status (1)

Country Link
GB (1) GB2308457A (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2111910A (en) * 1981-12-24 1983-07-13 Gao Ges Automation Org An identification card and a method of producing it
EP0139186A1 (en) * 1983-08-31 1985-05-02 Nippon Kokan Kabushiki Kaisha Apparatus for measuring film thickness
US4519064A (en) * 1980-10-27 1985-05-21 Nippon Columbia Kabushikikaisha Optical record disc
US4544836A (en) * 1982-12-22 1985-10-01 American District Telegraph Company Optically-based access control system
EP0188625A1 (en) * 1984-07-18 1986-07-30 Sony Corporation Method of producing optical data recording medium
JPH03105489A (en) * 1989-09-20 1991-05-02 Hitachi Ltd Method for detecting character on wafer
FR2674979A1 (en) * 1991-04-04 1992-10-09 Rotanotice Sa Protection and decoration label especially for an electric battery
GB2281129A (en) * 1993-08-19 1995-02-22 United Distillers Plc Method of marking a body of material

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4519064A (en) * 1980-10-27 1985-05-21 Nippon Columbia Kabushikikaisha Optical record disc
GB2111910A (en) * 1981-12-24 1983-07-13 Gao Ges Automation Org An identification card and a method of producing it
US4544836A (en) * 1982-12-22 1985-10-01 American District Telegraph Company Optically-based access control system
EP0139186A1 (en) * 1983-08-31 1985-05-02 Nippon Kokan Kabushiki Kaisha Apparatus for measuring film thickness
EP0188625A1 (en) * 1984-07-18 1986-07-30 Sony Corporation Method of producing optical data recording medium
JPH03105489A (en) * 1989-09-20 1991-05-02 Hitachi Ltd Method for detecting character on wafer
FR2674979A1 (en) * 1991-04-04 1992-10-09 Rotanotice Sa Protection and decoration label especially for an electric battery
GB2281129A (en) * 1993-08-19 1995-02-22 United Distillers Plc Method of marking a body of material

Also Published As

Publication number Publication date
GB9702716D0 (en) 1997-04-02

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)