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US5087670A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for fluorimetric monitoring of functional coatings and compositions and fluorescent agents therefor

Assignee: 3M Co
•
Filing: 1990-10-05
•
Granted: 1992-02-11
•
Expires: 2010-10-05
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Abstract

Abstract A method for monitoring the coating weight, uniformity, defects or markings present in a coating of a composition applied to a substrate comprises the steps: a) providing a substrate with a functional coating of a composition comprising an effective amount of uvescer that absorbs radiant energy, i.e., has an excitation energy, of wavelength λ 1 and emits radiant energy of wavelength λ 2 ; b) scanning the coating with radient energy having a wavelength within wavelength λ 1 ; c) detecting the radiant energy of wavelength λ 2 emitted by the coating; and d) optionally, correlating the emitted radiant energy to independently measured standard coating weights or thicknesses, of the coating so as to measure coating weight, thickness, uniformity, defects, or markings.

Inventors

  • 👤 Kurt C. Melancon
  • 👤 George V. D. Tiers

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 06:20
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/06; G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64; G01N21/6428; G01N2021/6439; G01N21/84; G01N21/8422; G01N2021/8427

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 97 words
A polymer having the formula ##STR17## wherein R 6 is independently selected from the group consisting of one or more of lower alkyl groups (C 1 to C 4 ) or phenyl groups, and c, d, and e are integers, the sum of which is 10 to 20,000, d is 0.01% to 10% of the sum, and e is 5% to 95% of the sum, and p and q are integers, the ratio of p/q being 0.2/1 to 5/1 and the number average molecular weights of the polymers containing p and q units being 500 to 20,000.
Claim 2
Dependent Claim 97 words
A polymer having the formula ##STR17## wherein R 6 is independently selected from the group consisting of one or more of lower alkyl groups (C 1 to C 4 ) or phenyl groups, and c, d, and e are integers, the sum of which is 10 to 20,000, d is 0.01% to 10% of the sum, and e is 5% to 95% of the sum, and p and q are integers, the ratio of p/q being 0.2/1 to 5/1 and the number average molecular weights of the polymers containing p and q units being 500 to 20,000.
Claim 3
Dependent Claim 24 words
The polymer according to claim 1 having the formula ##STR18## wherein R 6 , c, d, and e are as defined in claim 32.
Claim 4
Dependent Claim 20 words
The polymer according to claim 1 having the formula ##STR19## wherein p and q are as defined in claim 32.

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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) 1995-02-10 1995-08-12 1996-02-11 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1999-02-10 1999-08-12 2000-02-11 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2003-02-10 2003-08-12 2004-02-11 $7700.00 Window Closed / Lapsed

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