Patent US3193072A successfully refreshed from Google Patents.
US3556971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-regulating cathodic protection systems
Assignee: Corrpro Companies Inc
•
Filing: 1968-04-10
•
Granted: 1971-01-19
•
Expires: 1988-04-10
Abstract
Abstract A CATHODIC PROTECTION SYSTEM FOR SUPPLYING RELATIVELY CONSTANT CURRENT TO UNDERGROUND PROTECTED DEVICES CONSISTING OF AN ANODE ARRAY BURIED ADJACENT TO THE PROTECTED DEVICE AND A CAPACITOR INPUT, SOLID STATE RECTIVIER ARRANGEMENT FOR PROVIDING DIRECT CURRENT TO THE ARRAY AT A REGULATED VALUE. A FULL-WAVE RECTIFIER IN COMBINATION WITH AN ISOLATION TRANSFORMER OR A DIRECT-COUPLED HALF WAVE CONFIGURATION IS EMPLOYED, THE LATTER UTILIZING THE CONDUCTION OF A SECOND RECTIFIER TO PREVENT A DC LEVEL FROM APPEARING ON THE POWER LINES.
Inventors
- 👤 Bernard Husock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:01
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02; C23F13/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |