Patent US3883379A successfully refreshed from Google Patents.
US3883379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of improving the corrosion resistance of nickel-copper alloys
Assignee: United States Department of Energy
•
Filing: 1972-12-21
•
Granted: 1975-05-13
•
Expires: 1992-12-21
Abstract
Abstract The corrosion resistance of nickel-copper alloys containing 6370 wt. percent nickel to water is improved by immersing the alloy in concentrated hydrochloric acid for 24 hours at room temperature prior to exposure of the alloy to water.
Inventors
- 👤 Richard D Tokarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:29
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/28; C23F15/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
69 words
A METHOD OF IMPROVING THE CORROSION RESISTANCE TO HOT WATER OF A RESISTANCE TEMPERATURE DETECTOR INCLUDING A BODY FORMED OF A NICKEL-COPPER ALLOY CONTAINING 63-70 WT, PERCENT NICKEL AND MINOR AMOUNTS OF SULFUR, SAID ALLOY FURTHER CONTAINING MAGNESIUM RESIDUAL FROM THE FORMING PROCESS WHEREIN IT HAD BEEN USED AS A DEOXIDIZER, COMPRISING ETCHING THE DETECTOR BODY IN CONCENTRATED HYDROCHLORIC ACID PRIOR TO EXPOSURE OF THE DETECTOR TO HOT WATER.
Claim 2
Independent Claim
69 words
A METHOD OF IMPROVING THE CORROSION RESISTANCE TO HOT WATER OF A RESISTANCE TEMPERATURE DETECTOR INCLUDING A BODY FORMED OF A NICKEL-COPPER ALLOY CONTAINING 63-70 WT, PERCENT NICKEL AND MINOR AMOUNTS OF SULFUR, SAID ALLOY FURTHER CONTAINING MAGNESIUM RESIDUAL FROM THE FORMING PROCESS WHEREIN IT HAD BEEN USED AS A DEOXIDIZER, COMPRISING ETCHING THE DETECTOR BODY IN CONCENTRATED HYDROCHLORIC ACID PRIOR TO EXPOSURE OF THE DETECTOR TO HOT WATER.
Claim 3
Dependent Claim
71 words
A method according to claim 1 wherein the alloy contains 63-70 wt. percent nickel (plus cobalt) and a maximum of 0.30 wt. percent carbon, 2.0 wt. percent maganese, 2.5 wt. percent iron, 0.025 to 0.060 wt. percent sulfur and 0.50 wt. percent silicon, the balance being coppeR and wherein the detector body is etched in nominally 38 percent hydrochloric acid (reagent grade concentrated hydrochloric acid) for 24 hours at room temperature.
References Cited (Backward Citations)
US2680678A
Cited
US3702273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |