Patent US3647359A successfully refreshed from Google Patents.
US3647359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of mercury
Assignee: BP Chemicals Ltd
•
Filing: 1969-08-29
•
Granted: 1972-03-07
•
Expires: 1989-08-29
Abstract
Abstract Removal of mercury from a gas stream by washing the gas with alkaline hypochlorite containing added alkali metal or calcium chloride.
Inventors
- 👤 David Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:07
CPC Classifications
C; C22; C22B; C22B43/00; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/64
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
13 words
A process according to claim 1 wherein the alkaline hypochloride is sodium hypochlorite.
Claim 2
Dependent Claim
19 words
A process according to claim 1 wherein the pH of the alkaline hypochlorite solution is between 8 and 12.
Claim 3
Dependent Claim
59 words
A process according to claim 1 wherein mercury vapor is scrubbed with a solution of sodium hypochlorite containing between 0.02 g./l. and 25 g./l. of available chlorine, with a pH in the range 9 to 10.5 and a sodium chloride content of not less than 40 g./l. at pH 9 and not less than 140 g./l. at pH 10.5.
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |