US2642334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of neutralizing industrial waste
Assignee: Individual
•
Filing: 1947-09-20
•
Granted: 1953-06-16
•
Expires: 1967-09-20
Abstract
No abstract record available.
Inventors
- 👤 Anthony L Nugey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:32
CPC Classifications
C; C01; C01D; C01D1/00; C01D1/04; C01D1/20; C01G; C01G49/00; C01G49/02; C01G49/06; Y; Y10; Y10S; Y10S423/00; Y10S423/01; Y10S423/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
THE PROCESS OF TREATING LIQUID INDUSTRIAL WASTE CONTAINING SULPHURIC ACID AND FERROUS SULPHATE, CONSISTING IN ADDING SODIUM HYDROXIDE IN SUFFICIENT QUANTITY OF NEUTRALIZE THE ACID TO THE LIQUID AND AGITATING THE MIXTURE, FILTERING AND REMOVING THE IRON HYDROXIDE FILTERCAKE, HEATING THE LATTER TO FORM IRON OXIDE AND WATER, ADDING OXIDE OF LIME TO THE LIQUID FILTRATE I SUFFICIENT QUANTITY TO CONVERT THE FILTRATE INTO A LIQUID MIXTURE OF CALCIUM SULPHAT AND SODIUM HYDROXIDE AND AGITATING THE MIXTURE, FILTERING SAID LAST-NAMED MIXTURE TO REMOVE THE CALCIUM SULPHATE, RETURNING PART OF THE SODIUM HYDROXIDE IN SAID LAST-NAMED MIXTURE TO REPLENISH THE SODIUM HYDROXIDE ORIGINALLY USED, AND TREATING THE REMAINDER OF THE SECOND FILTRATE WITH HEAT AND CARBON DIOXIDE TO FORM SODIUM CARBONATE.
Claim 2
Dependent Claim
120 words
THE PROCESS OF TREATING LIQUID INDUSTRIAL WASTE CONTAINING SULPHURIC ACID AND FERROUS SULPHATE, CONSISTING IN ADDING SODIUM HYDROXIDE IN SUFFICIENT QUANTITY OF NEUTRALIZE THE ACID TO THE LIQUID AND AGITATING THE MIXTURE, FILTERING AND REMOVING THE IRON HYDROXIDE FILTERCAKE, HEATING THE LATTER TO FORM IRON OXIDE AND WATER, ADDING OXIDE OF LIME TO THE LIQUID FILTRATE I SUFFICIENT QUANTITY TO CONVERT THE FILTRATE INTO A LIQUID MIXTURE OF CALCIUM SULPHAT AND SODIUM HYDROXIDE AND AGITATING THE MIXTURE, FILTERING SAID LAST-NAMED MIXTURE TO REMOVE THE CALCIUM SULPHATE, RETURNING PART OF THE SODIUM HYDROXIDE IN SAID LAST-NAMED MIXTURE TO REPLENISH THE SODIUM HYDROXIDE ORIGINALLY USED, AND TREATING THE REMAINDER OF THE SECOND FILTRATE WITH HEAT AND CARBON DIOXIDE TO FORM SODIUM CARBONATE.
References Cited (Backward Citations)
US53839A
Cited
US1637514A
Cited
US708585A
Cited
US802928A
Cited
US1254009A
Cited
US1547624A
Cited
US1596363A
Cited
US2072177A
Cited
US2271524A
Cited
US2258310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-15 | 1956-12-15 | 1957-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-15 | 1960-12-15 | 1961-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-15 | 1964-12-15 | 1965-06-16 | $7700.00 | Window Closed / Lapsed |