US2878173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for cathodic protection of ship hulls in sea water by electron concentration
Assignee: Individual
•
Filing: 1957-06-04
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Granted: 1959-03-17
•
Expires: 1977-06-04
Abstract
No abstract record available.
Inventors
- 👤 Obermann Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:55
CPC Classifications
B; B63; B63B; B63B59/00; B63B59/04; C; C23; C23F; C23F13/00; C23F13/02; C23F13/04; C23F13/06; C23F2213/00; C23F2213/30; C23F2213/31
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A METHOD OF SUBSTANTIALLY REDUCING CORROSION OF THE HULL OF A SHIP EXCEEDING 15,000 SQUARE FEET OF SUBMERGED SURFACE WHICH COMPRISES: PROVINDING AT LEAST THREE POWER FED ANODES MOUNTED ON THE HULL AND INSULATED THEREFROM BY A DIELECTRIC PANEL, EACH SAID ANODE BEING CONSTRUCTED AND MOUNTED TO HAVE A RESISTANCE EXCEEDING 0.45 OHM FOR TH ANODE TO SEA WATER OF TH GULF STREAM; PASSING LOW VOLTAGE DIRECT CURRENT IN EXCESS OF ABOUT 3 VOLTS TO EACH SAID ANODE AND THEREBY APPLYING CURRENT TO SAID HULL IN EXCESS FO 0.05 MILLIAMPERE PER SQUARE FOOT OF HULL SURFACE SUBMERGED IN A SEA WATER ENVIRONMENT, SAID DIRECT CURRENT BEING OF A MAGNITUDE BELOW THAT NEEEDED FOR POLARIZATION OF THE ENTIRE HULL WHEREBY THE OPEN CIRCUIT VOLTAGE OF SAID PROTECTED HULL IN SEA WATER DOES NOT EXEED -0.07 VOLT AS MEASURED AGAINST A CALOMEL HALF CELL.
Claim 2
Independent Claim
142 words
A METHOD OF SUBSTANTIALLY REDUCING CORROSION OF THE HULL OF A SHIP EXCEEDING 15,000 SQUARE FEET OF SUBMERGED SURFACE WHICH COMPRISES: PROVINDING AT LEAST THREE POWER FED ANODES MOUNTED ON THE HULL AND INSULATED THEREFROM BY A DIELECTRIC PANEL, EACH SAID ANODE BEING CONSTRUCTED AND MOUNTED TO HAVE A RESISTANCE EXCEEDING 0.45 OHM FOR TH ANODE TO SEA WATER OF TH GULF STREAM; PASSING LOW VOLTAGE DIRECT CURRENT IN EXCESS OF ABOUT 3 VOLTS TO EACH SAID ANODE AND THEREBY APPLYING CURRENT TO SAID HULL IN EXCESS FO 0.05 MILLIAMPERE PER SQUARE FOOT OF HULL SURFACE SUBMERGED IN A SEA WATER ENVIRONMENT, SAID DIRECT CURRENT BEING OF A MAGNITUDE BELOW THAT NEEEDED FOR POLARIZATION OF THE ENTIRE HULL WHEREBY THE OPEN CIRCUIT VOLTAGE OF SAID PROTECTED HULL IN SEA WATER DOES NOT EXEED -0.07 VOLT AS MEASURED AGAINST A CALOMEL HALF CELL.
References Cited (Backward Citations)
US1467890A
Cited
GB614799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |