Patent US3173880A successfully refreshed from Google Patents.
US3173880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moisture indicator and method of making the same
Assignee: Individual
•
Filing: 1961-07-13
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Granted: 1965-03-16
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Expires: 1981-07-13
Abstract
No abstract record available.
Inventors
- 👤 William S Pappas
- 👤 Charles W Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:41
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/222
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
59 words
THE METHOD OF PREPARING A MOISTURE INDICTOR WHICH COMPRISES WETTING ACTIVATED SILICA GEL WITH AN AQUEOUS SOLUTION CONTAINING COLBALTOUS BROMIDE WITHIN THE RANGE OF APROXIMATELY 2 TO 3 PERCENT BY WEIGHT OF SAID SILICA GEL AND HYDROBROMIC ACID IN AN AMOUNT OF AT LEAST APPROXIMATELY 0.5 PERCENT BY WEIGHT OF SAID SILICA GEL AND DRYING THE RESULTING WETTED GEL.
Claim 2
Independent Claim
59 words
THE METHOD OF PREPARING A MOISTURE INDICTOR WHICH COMPRISES WETTING ACTIVATED SILICA GEL WITH AN AQUEOUS SOLUTION CONTAINING COLBALTOUS BROMIDE WITHIN THE RANGE OF APROXIMATELY 2 TO 3 PERCENT BY WEIGHT OF SAID SILICA GEL AND HYDROBROMIC ACID IN AN AMOUNT OF AT LEAST APPROXIMATELY 0.5 PERCENT BY WEIGHT OF SAID SILICA GEL AND DRYING THE RESULTING WETTED GEL.
Claim 3
Dependent Claim
81 words
INDICATING MATERIAL FOR DETERMINING THE MOISTURE CONTENT OF DICHLOROTETRAFLUOROETHANE CONSISTING OF ACTIVATED SILICA GEL IMPREGNATED WITH APPROXIMATERLY 2 TO 3 WEIGHT PERCENT COBALTOUS BROMIDE AND AT LEAST 0.5 WEIGHT PERCENT HYDROBROMIC ACID, SAID SILICAA GEL BEING PIINK IN COLOR WHEN EXPOSED TO DICHLOROTETRAFLUOROETHANE CONTAINING MORE THAN APPROXIMATELY 15 PARTS PER MILLION OF MOISTURE AT A TEMPERATURE OF 90*F. TO 120*F. AND GREEN IN COLOR WHEN EXPOSED TO DICHLOROTETRAFLUOROETHANE CONTAINING LESS THAN APPROXIMATELY 15 PARTS PER MILLION OF MOISTURE AT SAID TEMPERATURE.
Claim 4
Dependent Claim
81 words
INDICATING MATERIAL FOR DETERMINING THE MOISTURE CONTENT OF DICHLOROTETRAFLUOROETHANE CONSISTING OF ACTIVATED SILICA GEL IMPREGNATED WITH APPROXIMATERLY 2 TO 3 WEIGHT PERCENT COBALTOUS BROMIDE AND AT LEAST 0.5 WEIGHT PERCENT HYDROBROMIC ACID, SAID SILICAA GEL BEING PIINK IN COLOR WHEN EXPOSED TO DICHLOROTETRAFLUOROETHANE CONTAINING MORE THAN APPROXIMATELY 15 PARTS PER MILLION OF MOISTURE AT A TEMPERATURE OF 90*F. TO 120*F. AND GREEN IN COLOR WHEN EXPOSED TO DICHLOROTETRAFLUOROETHANE CONTAINING LESS THAN APPROXIMATELY 15 PARTS PER MILLION OF MOISTURE AT SAID TEMPERATURE.
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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) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |