Patent US3154872A successfully refreshed from Google Patents.
US3154872A
Expired / Lapsed
US
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Tamper-proof markings for reflecting structures
Assignee: 3M Co
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Filing: 1963-02-13
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Granted: 1964-11-03
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Expires: 1983-02-13
Abstract
No abstract record available.
Inventors
- 👤 Orville J Nordgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:10
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/12; G02B5/126; G02B5/128; B; B42; B42D; B42D25/00; B42D25/20; B42D25/29; D; D06; D06H; D06H1/00; G06; G06K; G06K19/00; G06K19/06; G06K19/08; G06K19/10; G06K19/14; B42D2033/04; B42D2033/10; B42D2033/18; B42D2035/20; Y; Y10; Y10S; Y10S428/00; Y10S428/916
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
IN A REFLEX-REFLECTING SHEET STRUCTURE HAVING, AT LEAST IN ONE PORTION THEREOF, A CONTINUOUS BACK REFLECTOR AND A COMPACT MONOLAYER OF TRANSPARENT BEADS THEREOVER AND TRANSPARENTLY BONDED IN OPTICAL CONNECTION THEREWITH, THE IMPROVEMENT CHARACTERIZED BY THE FEATURE THAT SAID CONTINUOUS BACK REFLECTOR IS A SPECULAR-REFLECTING METALLIC REFLECTOR PROVIDED WITH SEMI-SPECULAR PIGMENTED LEGEND MARKINGS NO GREATER THAN ABOUT 1/64 INCH IN WIDTH ON A MINOR PORTION THEREOF, SAID MARKINGS BEING SUCH THAT THEY EXHIBIT A TOTAL INTENSITY OF SPECULAR REFLECTION IN THE VISIBLE SPECTRUM ON THE ORDER OF 40-90% THE TOTAL INTENSITY OF SPECULAR REFLECTION IN THE VISIBLE SPECTRUM EXHIBITED BY SAID HIGHLY SPECULAR METALLIC REFLECTOR, WHEREBY SAID LEGEND MARKINGS ARE VISIBLE TO THE NAKED EYE OF AN OBSERVER VIEWING THE FRONT FACE OF SAID REFLEX-REFLECTING STRUCTURE UNDER DAYTIME DIFFUSE-LIGHTING CONDITIONS, BUT BECOME VISIBLY INDISTINCT TO THE OBSERVER WHEN THE FACE OF THE STRUCTURE IS VIEWED UNDER REFLEX-REFLECTING CONDITIONS.
Claim 2
Dependent Claim
148 words
IN A REFLEX-REFLECTING SHEET STRUCTURE HAVING, AT LEAST IN ONE PORTION THEREOF, A CONTINUOUS BACK REFLECTOR AND A COMPACT MONOLAYER OF TRANSPARENT BEADS THEREOVER AND TRANSPARENTLY BONDED IN OPTICAL CONNECTION THEREWITH, THE IMPROVEMENT CHARACTERIZED BY THE FEATURE THAT SAID CONTINUOUS BACK REFLECTOR IS A SPECULAR-REFLECTING METALLIC REFLECTOR PROVIDED WITH SEMI-SPECULAR PIGMENTED LEGEND MARKINGS NO GREATER THAN ABOUT 1/64 INCH IN WIDTH ON A MINOR PORTION THEREOF, SAID MARKINGS BEING SUCH THAT THEY EXHIBIT A TOTAL INTENSITY OF SPECULAR REFLECTION IN THE VISIBLE SPECTRUM ON THE ORDER OF 40-90% THE TOTAL INTENSITY OF SPECULAR REFLECTION IN THE VISIBLE SPECTRUM EXHIBITED BY SAID HIGHLY SPECULAR METALLIC REFLECTOR, WHEREBY SAID LEGEND MARKINGS ARE VISIBLE TO THE NAKED EYE OF AN OBSERVER VIEWING THE FRONT FACE OF SAID REFLEX-REFLECTING STRUCTURE UNDER DAYTIME DIFFUSE-LIGHTING CONDITIONS, BUT BECOME VISIBLY INDISTINCT TO THE OBSERVER WHEN THE FACE OF THE STRUCTURE IS VIEWED UNDER REFLEX-REFLECTING CONDITIONS.
References Cited (Backward Citations)
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US2407680A
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US2531945A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-03 | 1968-05-04 | 1968-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-03 | 1972-05-04 | 1972-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-03 | 1976-05-04 | 1976-11-03 | $7700.00 | Window Closed / Lapsed |