US3692490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water tester for pools
Assignee: Individual
•
Filing: 1970-10-23
•
Granted: 1972-09-19
•
Expires: 1990-10-23
Abstract
Abstract AN APPARATUS FOR CHECKING THE ACIDITY, ALKALINITY AND THE CHLORINE CONTENT OF POOL WATER BY SIMULTANEOUSLY WITHDRAWING INTO TWO SEPARATE CONTAINERS PREDETERMINED SAMPLES FROM A GIVEN DEPTH IN THE POOL, SIMULTANEOUSLY INJECTING INTO EACH SAMPLE A GIVEN AMOUNT OF A DIFFERENT TESTING REAGENT, AND SIMULTANEOUSLY EJECTING THE WATER SAMPLES TESTED FROM EACH CONTAINER AFTER OBSERVING THE TEST RESULTS.
Inventors
- 👤 Thomas A Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:46
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/10; G01N1/12; G01N27/00; G01N27/26; G01N27/416; G01N27/4166; G01N27/4168
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |