US2695875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of hydrochloric acid solutions
Assignee: Rohm and Haas Co
•
Filing: 1951-10-05
•
Granted: 1954-11-30
•
Expires: 1971-10-05
Abstract
No abstract record available.
Inventors
- 👤 Francis X Mcgarvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:10
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A CYCLIC PROCESS FOR THE REMOVAL OF DISSOLVED FERRIC IRON IMPURITIES FROM HYDROCHLORIC ACID HAVING A CONCENTRATION OF AT LEAST SIX MOLARS WHICH COMPRISES TREATING SAID HYDROCHLORIC ACID CONTAINING SAID IRON IMPURITIES WITH AN ANION-EXCHANGE RESIN CONTAINING QUATERNARY AMMONIUM CHLORIDE GROUPS AS ITS POLAR GROUPS, SEPARATING SAID RESIN AND SAID HYDROCHLORIC ACID AND REGENERATING SAID RESIN BY WASHING IT WITH A VOLUME OF WATER EQUAL TO AT LEAST 90% OF THE VOLUME OF SAID RESIN.
Claim 2
Dependent Claim
75 words
A CYCLIC PROCESS FOR THE REMOVAL OF DISSOLVED FERRIC IRON IMPURITIES FROM HYDROCHLORIC ACID HAVING A CONCENTRATION OF AT LEAST SIX MOLARS WHICH COMPRISES TREATING SAID HYDROCHLORIC ACID CONTAINING SAID IRON IMPURITIES WITH AN ANION-EXCHANGE RESIN CONTAINING QUATERNARY AMMONIUM CHLORIDE GROUPS AS ITS POLAR GROUPS, SEPARATING SAID RESIN AND SAID HYDROCHLORIC ACID AND REGENERATING SAID RESIN BY WASHING IT WITH A VOLUME OF WATER EQUAL TO AT LEAST 90% OF THE VOLUME OF SAID RESIN.
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) | 1957-11-29 | 1958-05-31 | 1958-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-29 | 1962-05-31 | 1962-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-29 | 1966-05-31 | 1966-11-30 | $7700.00 | Window Closed / Lapsed |