US2778798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color indication means and method for ion exchange material
Assignee: Culligan Inc
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Filing: 1953-11-10
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Granted: 1957-01-22
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Expires: 1973-11-10
Abstract
No abstract record available.
Inventors
- 👤 George H Klumb
- 👤 Murl B Sailsbury
- 👤 Robert E Schulze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:32
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; B; B01; B01J; B01J47/00; B01J47/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
THE METHOD OF EVALUATING THE QUALITY OF LIQUIDS TREATED BY A LOOSE MEANS OF ION EXCCHANGE MATERIAL INCLUDING AN ANION EXCHANGER OF THE QUATERNARY AMMONIUM TYPE, COMPRISING APPLYING TO SAID MASS OF MATERIAL AN FD & C TRIPHENYLMETHANE INDICATING DYESTUFF POSSESSING NO DELETERIOUS PROPERTIES FROM A PHYSIOLOGICAL STANDPOINT, SAID DYESTUFF BEING ABSORBED BY SAID MATERIAL AND WHEN ABSORBED IMPARTING NO SUBSTANTIAL CHANGE IN COLOR TO THE ION EXCHANGE MATERIAL UNTIL SUCH MATERIAL REACHES A STATE OF SUBSTANTIAL EXHAUSTION WHEN THE COLOR OF THE DYESTUFF APPEARS.
Claim 2
Independent Claim
85 words
THE METHOD OF EVALUATING THE QUALITY OF LIQUIDS TREATED BY A LOOSE MEANS OF ION EXCCHANGE MATERIAL INCLUDING AN ANION EXCHANGER OF THE QUATERNARY AMMONIUM TYPE, COMPRISING APPLYING TO SAID MASS OF MATERIAL AN FD & C TRIPHENYLMETHANE INDICATING DYESTUFF POSSESSING NO DELETERIOUS PROPERTIES FROM A PHYSIOLOGICAL STANDPOINT, SAID DYESTUFF BEING ABSORBED BY SAID MATERIAL AND WHEN ABSORBED IMPARTING NO SUBSTANTIAL CHANGE IN COLOR TO THE ION EXCHANGE MATERIAL UNTIL SUCH MATERIAL REACHES A STATE OF SUBSTANTIAL EXHAUSTION WHEN THE COLOR OF THE DYESTUFF APPEARS.
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) | 1960-01-22 | 1960-07-23 | 1961-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-22 | 1964-07-23 | 1965-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-22 | 1968-07-23 | 1969-01-22 | $7700.00 | Window Closed / Lapsed |