US2736637A
Expired / Lapsed
US
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Water hardness measurement-method and apparatus
Assignee: Veolia WTS Systems USA Inc
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Filing: 1952-07-24
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Granted: 1956-02-28
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Expires: 1972-07-24
Abstract
No abstract record available.
Inventors
- 👤 Juda Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:48
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/18; G01N33/1853; B; B01; B01J; B01J47/00; B01J47/14; G01N27/00; G01N27/02; G01N27/04; G01N27/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
44 words
A METHOD OF MEASURING THE HARDNESS OF WATER COMPRISING PROVIDING A MASS OF A CATION EXCHANGE RESIN HAVING SODIUM AS THE EXCHANGEABLE IONS, DETERMINING THE CONDUCTIVITY OF THE MASS AFTER IMMERSION IN SUBSTANTIALLY SOFT WATER, THEN PASSING WATER TO BE TESTED OVER SAID MASS,
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) | 1959-02-27 | 1959-08-29 | 1960-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-27 | 1963-08-29 | 1964-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-27 | 1967-08-29 | 1968-02-28 | $7700.00 | Window Closed / Lapsed |