Patent US4545873A successfully refreshed from Google Patents.
US4545873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vessel for an unstable solution of a metal salt or complex and method for sealing such vessel
Assignee: Novartis AG
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Filing: 1983-01-10
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Granted: 1985-10-08
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Expires: 2003-01-10
Abstract
Abstract The rotating shaft is sealingly mounted in a wall of the vessel by a liquid-tight lip seal. In order to avoid undesired depositions on the seal the latter is made of electroconductive material and connected to the anode of a source of electricity the cathode of which is connected to a counter-electrode within the vessel.
Inventors
- 👤 Colin C. Blake
- 👤 Paul A. Bacon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:27
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/005; C25; C25C; C25C7/00; C25C7/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
82 words
A method of sealing a pressurised vessel which has a reciprocating or rotating shaft and which contains an unstable solution of a metal salt or complex, said method comprising forming a seal for the shaft composed at least in part of an electro-conductive material, inserting in the body of the vessel a counter-electrode electrically connected to the shaft and applying a voltage across the seal and the counter-electrode so that the seal is made the anode electrode of the thus formed cell.
Claim 2
Independent Claim
82 words
A method of sealing a pressurised vessel which has a reciprocating or rotating shaft and which contains an unstable solution of a metal salt or complex, said method comprising forming a seal for the shaft composed at least in part of an electro-conductive material, inserting in the body of the vessel a counter-electrode electrically connected to the shaft and applying a voltage across the seal and the counter-electrode so that the seal is made the anode electrode of the thus formed cell.
Claim 3
Dependent Claim
19 words
A method according to claim 1 wherein the unstable solution is a solution of a silver salt or complex.
Claim 4
Dependent Claim
73 words
A vessel for an unstable solution of a metal salt or complex comprising a reciprocating or rotating shaft extending through a wall of the vessel and mounted in a liquid-tight seal, whereby at least part of said seal is of electro-conductive material, said vessel further comprising a counter-electrode in its body electrically connected to the shaft and electric terminals electrically connected to said seal and said counter-electrode for applying a voltage there across.
Claim 5
Dependent Claim
73 words
A vessel for an unstable solution of a metal salt or complex comprising a reciprocating or rotating shaft extending through a wall of the vessel and mounted in a liquid-tight seal, whereby at least part of said seal is of electro-conductive material, said vessel further comprising a counter-electrode in its body electrically connected to the shaft and electric terminals electrically connected to said seal and said counter-electrode for applying a voltage there across.
Claim 6
Dependent Claim
30 words
A vessel according to claim 3 wherein the seal is a mechanical face seal having a rotating and a non-rotating part whereby at least the latter is of electro-conductive material.
Claim 7
Dependent Claim
12 words
A vessel according to claim 4 wherein the electro-conductive material is graphite.
Claim 8
Dependent Claim
19 words
A vessel according to claim 3 wherein the seal is a lip seal which is made of electro-conductive material.
Claim 9
Dependent Claim
15 words
A vessel according to claim 6 wherein the electro-conductive material is graphite or stainless steel.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-07 | 1989-04-08 | 1989-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-07 | 1993-04-08 | 1993-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-07 | 1997-04-08 | 1997-10-08 | $7700.00 | Window Closed / Lapsed |