US3582768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Industrial water testing device
Assignee: ChampionX LLC
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Filing: 1969-06-20
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Granted: 1971-06-01
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Expires: 1989-06-20
Abstract
Abstract Device for testing industrial waters to determine optical density and/or electrical conductivity, wherein the device is portable and operable from a self contained power source or conventional line voltage to provide direct readings of optical density and electrical conductivity. Selector switches on the device, together with a meter having interchangeable faces, facilitate quick changeover for testing of different water conditions.
Inventors
- 👤 William R Watson
- 👤 James J Moran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:26
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/18; G01N33/1886; G01N27/00; G01N27/02; G01N27/04; G01N27/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2122363A
Cited
US2550936A
Cited
US2526636A
Cited
GB1009721A
Cited
US3361150A
Cited
US3337798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |