US3113093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathodic protection system
Assignee: Engelhard Industries Inc
•
Filing: 1959-02-03
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Granted: 1963-12-03
•
Expires: 1979-02-03
Abstract
No abstract record available.
Inventors
- 👤 Max J Hoberman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:51
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02; C23F13/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN A CATHODIC PROTECTION SYSTEM, A SURFACE TO BE CATHODICALLY PROTECTED, AT LEAST ONE ANODE MOUNTED NEAR SAID CATHODIC SURFACE, MEANS FOR APPLYING DIRECT CURRENT BETWEEN THE ANODE AND THE CATHODIC SURFACE, A SENSING CELL MOUNTED IN SPACED RELATIONSHIP WITH RESPECT TO SAID SURFACE AND CONSTITUTING TOGETHER WITH SAID SURFACE, A SENSING CIRCUIT FOR DEVELOPING VOLTAGE CONTROL SIGNALS INDICATING CATHODIC PROTECTION CONDITIONS OF THE CATHODIC SURFACE, VARIABLE GAIN CIRCUIT MEANS RESPONSIVE TO SAID SENSING CIRCUIT AND SOUPLING SAID CONTROL SIGNALS TO SAID CURRENT APPLYING MEANS TO CONTROL SAID CURRENT APPLYING MEANS, AND MEANS RESPONSIVE TO OSCILLATIONS IN THE CURRENT APPLIED BETWEEN THE ANODE AND THE CATHODIC SURFACE AND COUPLED TO SAID VARIABLE GAIN CIRCUIT MEANS FOR VARYING THE AMPLIFICATION OF SAID VARIABLE GAIN CIRCUIT MEANS.
Claim 2
Dependent Claim
125 words
IN A CATHODIC PROTECTION SYSTEM, A SURFACE TO BE CATHODICALLY PROTECTED, AT LEAST ONE ANODE MOUNTED NEAR SAID CATHODIC SURFACE, MEANS FOR APPLYING DIRECT CURRENT BETWEEN THE ANODE AND THE CATHODIC SURFACE, A SENSING CELL MOUNTED IN SPACED RELATIONSHIP WITH RESPECT TO SAID SURFACE AND CONSTITUTING TOGETHER WITH SAID SURFACE, A SENSING CIRCUIT FOR DEVELOPING VOLTAGE CONTROL SIGNALS INDICATING CATHODIC PROTECTION CONDITIONS OF THE CATHODIC SURFACE, VARIABLE GAIN CIRCUIT MEANS RESPONSIVE TO SAID SENSING CIRCUIT AND SOUPLING SAID CONTROL SIGNALS TO SAID CURRENT APPLYING MEANS TO CONTROL SAID CURRENT APPLYING MEANS, AND MEANS RESPONSIVE TO OSCILLATIONS IN THE CURRENT APPLIED BETWEEN THE ANODE AND THE CATHODIC SURFACE AND COUPLED TO SAID VARIABLE GAIN CIRCUIT MEANS FOR VARYING THE AMPLIFICATION OF SAID VARIABLE GAIN CIRCUIT MEANS.
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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) | 1966-12-02 | 1967-06-03 | 1967-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-02 | 1971-06-03 | 1971-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-02 | 1975-06-03 | 1975-12-03 | $7700.00 | Window Closed / Lapsed |