US3693323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the trapping of mercury vapors and apparatus therefor
Assignee: Consolidation Coal Co
•
Filing: 1970-12-30
•
Granted: 1972-09-26
•
Expires: 1990-12-30
Abstract
Abstract An improved process and apparatus for the collection of mercury vapors from a volume of air or other gases. The improvement comprises the direct resistance heating of a noble-metal absorbent in a mercury trap to release absorbed mercury for the subsequent measurement thereof.
Inventors
- 👤 Preston L Gant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:58
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/28; G01N1/40; G01N1/405; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/64; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027; G01N33/0036; G01N33/0045
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
21 words
The improvement of claim 1 wherein said noble-metal having mercury collected thereon is resistance heated to a temperature above 450* C.
Claim 2
Independent Claim
88 words
An apparatus for collecting mercury vapor from a volume of gases for the subsequent measurement thereof which comprises: a hollow chamber having an opening at opposite ends thereof, a resistance wire having a noblE-metal plating thereon secured by means therefor in said chamber for the absorption on said noble-metal plating of mercury vapor present in a gas passed therethrough, means for connecting said resistance wire to a power source for direct resistance heating thereof, and means for collecting mercury desorbed when said means for resistance heating is activated.
Claim 3
Dependent Claim
14 words
The apparatus of claim 3 wherein the noble-metal plated on said wire is gold.
Claim 4
Dependent Claim
13 words
The apparatus of claim 3 wherein said plated wire is helical in shape.
Claim 5
Dependent Claim
11 words
The apparatus of claim 3 wherein said plated wire is hollow.
References Cited (Backward Citations)
US1711742A
Cited
US2345090A
Cited
US3193987A
Cited
US3232033A
Cited
US3374608A
Cited
US3608273A
Cited
US3568411A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |