Patent US3216802A successfully refreshed from Google Patents.
US3216802A
Expired / Lapsed
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Method and reagent for determining moisture content of paper
Assignee: West Virginia Pulp and Paper Co
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Filing: 1962-01-24
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Granted: 1965-11-09
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Expires: 1982-01-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles J Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:28
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/222
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
THE METHOD OF DETERMINING THE MOISTURE CONTENT OF FIBROUS WEBS WHICH COMPRISES CONTACTING THE FIBROUS WEB WITH AN ESSENTIALLY ANHYDROUS SOLUTION OF COBALTOUS CHLORIDE AND A DYE OF A YELLOW TO RED COLORATION IN A VOLATILE SOLVENT SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL, ACETONE, AND MIXTURES THEREOF, EFFECTING EVAPORATION OF THE SOLVENT FROM THE FIBROUS WEB TO LEAVE A NON-VOLATILE RESIDUE CONTAINING THE COBALTOUS CHLORIDE, OBSERVING THE COLOR OF THE RESIDUE REMAINING ON THE FIBROUS WEB, AND COMPARING THE COLOR OBSERVED AGAINST A STANDARD COLOR CHART INDICATING THE COLOR OBTAINED EMPLOYING A SIMILAR SOLUTION ON FIBROUS WEBS OF KNOWN MOISTURE CONTENT.
Claim 2
Independent Claim
103 words
THE METHOD OF DETERMINING THE MOISTURE CONTENT OF FIBROUS WEBS WHICH COMPRISES CONTACTING THE FIBROUS WEB WITH AN ESSENTIALLY ANHYDROUS SOLUTION OF COBALTOUS CHLORIDE AND A DYE OF A YELLOW TO RED COLORATION IN A VOLATILE SOLVENT SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL, ACETONE, AND MIXTURES THEREOF, EFFECTING EVAPORATION OF THE SOLVENT FROM THE FIBROUS WEB TO LEAVE A NON-VOLATILE RESIDUE CONTAINING THE COBALTOUS CHLORIDE, OBSERVING THE COLOR OF THE RESIDUE REMAINING ON THE FIBROUS WEB, AND COMPARING THE COLOR OBSERVED AGAINST A STANDARD COLOR CHART INDICATING THE COLOR OBTAINED EMPLOYING A SIMILAR SOLUTION ON FIBROUS WEBS OF KNOWN MOISTURE CONTENT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |