US2961311A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal ion control
Assignee: Dow Chemical Co
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Filing: 1955-12-13
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Granted: 1960-11-22
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Expires: 1975-12-13
Abstract
No abstract record available.
Inventors
- 👤 Frederick C Bersworth
- 👤 Arthur E Martell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:48
CPC Classifications
C; C12; C12N; C12N1/00; B; B01; B01J; B01J19/00; B01J19/0086; C05; C05D; C05D9/00; C05D9/02; C12N1/38; Y; Y10; Y10S; Y10S71/00; Y10S71/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
THE METHOD OF MAINTAINING AND CONTROLLING METAL ION AND HYDROGEN ION CONCENTRATION SIMULTANEOUSLY AT A PREDERTERMINED LEVVEL TO MAINTAIN PH WITHIN ABOUT 0.5 UNIT OF STARTING LEVEL IN A MENSTRUM IN THE PH RANGE FROM 5 TO ABOUT 10, WWHICH COMPRISES ADDING TO SAID MENSTRUUM A COMPOSITION CONSISTING OF A MIXTURE OF TWO ALKALI METAL SALTS OF A CHELATING AGENT AND A PERFORMED METAL COMPLEX OF SAID CHELATING AGENT, THE CHELATING AGENT HAVING THE FOLLOWING GENERAL FORMULA:
Claim 2
Independent Claim
77 words
THE METHOD OF MAINTAINING AND CONTROLLING METAL ION AND HYDROGEN ION CONCENTRATION SIMULTANEOUSLY AT A PREDERTERMINED LEVVEL TO MAINTAIN PH WITHIN ABOUT 0.5 UNIT OF STARTING LEVEL IN A MENSTRUM IN THE PH RANGE FROM 5 TO ABOUT 10, WWHICH COMPRISES ADDING TO SAID MENSTRUUM A COMPOSITION CONSISTING OF A MIXTURE OF TWO ALKALI METAL SALTS OF A CHELATING AGENT AND A PERFORMED METAL COMPLEX OF SAID CHELATING AGENT, THE CHELATING AGENT HAVING THE FOLLOWING GENERAL FORMULA:
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) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |