Patent US3607673A successfully refreshed from Google Patents.
US3607673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for measuring corrosion rate
Assignee: Magna Corp
•
Filing: 1968-03-18
•
Granted: 1971-09-21
•
Expires: 1988-03-18
Abstract
Abstract A system for correcting for the IR drop between electrodes when corrosion rate of the electrodes is measured by applying a small DC voltage across the electrodes. Ionic conductor resistance is measured by an AC circuit and the AC circuit is then used to adjust a resistor to an equivalent value whereupon the adjustable resistor is used to add a compensating voltage gain to the voltage applying circuit.
Inventors
- 👤 Robert G Seyl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:43
CPC Classifications
G; G01; G01N; G01N17/00; G01N17/02; G01N27/00; G01N27/26; G01N27/416; G01N27/49
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
57 words
The method of claim 1 wherein said adjustable resistance is connected in series with the DC voltage applying circuit after adjustment of said resistance, said compensating voltage is equal to the IR value of said resistance when so connected, and said adjustable resistance is made ineffective in said voltage delivery circuit after said compensating voltage is added.
Claim 2
Dependent Claim
22 words
The method of claim 2 wherein said adjustable resistance is made ineffective by switching it out of said DC voltage applying circuit.
Claim 3
Dependent Claim
38 words
The method of claim 2 wherein said adjustable resistance is made ineffective by leaving it in the voltage delivery circuit while balancing the IR value of the resistance with an additional compensating voltage during subsequent polarization voltage measurements.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |