US3006735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quick-dip indicator
Assignee: Morton Salt Co
•
Filing: 1959-09-22
•
Granted: 1961-10-31
•
Expires: 1979-09-22
Abstract
No abstract record available.
Inventors
- 👤 Robert H Jordan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:49
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
136 words
A METHOD FOR MEASURING THE HARDNESS OF WATER WHICH COMPRISES MOMENTARILY CONTACTING SAID WATER WITH A QUICK-DIP INDICATOR COMPRISING A CARRIER ABSORPTIVE TO WATER, SAID CARRIER HAVING A PLURALITY OF INDIVIDUAL AREAS, EACH OF WHICH IS IMPREGNATED WITH A SUBSTANCE COLORRESPONSIVE TO A DIFFERENT CONCENTRATION OF CALCIUM AND MAGNESIUM IONS, SAID SUBSTANCE IN EACH INDIVIDUAL AREA COMPRISING A DERIVATIVE OF AN AMINOPOLYCARBOXYLIC ACID AND AN INDICATOR COLOR-RESPONSIVE TO THE PRESENCE OF CALCIUM AND MAGNESIUM IONS, THE AMOUNT OF SAID DERIVATIVE BEING VARIED IN THE INDIVIDUAL AREAS TO ACHIEVE THE DIFFERENT COLOR-RESPONSIVENESSES, THE CONTACTING STEP BEING SUFFICIENT TO COMPLETELY IMMERSE SAID INDIVIDUAL AREAS, WHEREBY CONCENTRATION OF CALCIUM AND MAGNESIUM IONS IS INDICATED BY THE COLOR RESPONSE OF THOSE INDIVIDUAL AREAS COLOR-RESPONSIVE TO CONCENTRATIONS NOT IN EXCESS OF THE CONCENTRATION OF CALCIUM AND MAGNESIUM IONS IN SAID WATER.
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) | 1964-10-30 | 1965-05-01 | 1965-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-30 | 1969-05-01 | 1969-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-30 | 1973-05-01 | 1973-10-31 | $7700.00 | Window Closed / Lapsed |