Patent US2802781A successfully refreshed from Google Patents.
US2802781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathodic protection apparatus
Assignee: Dow Chemical Co
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Filing: 1954-05-12
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Granted: 1957-08-13
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Expires: 1974-05-12
Abstract
No abstract record available.
Inventors
- 👤 Robert L Featherly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:57
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02; C23F13/06; C23F13/08; C23F13/18; C23F13/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A CATHODIC PROTECTION SYSTEM COMPRISING WIITH A TANK HAVING METAL SURFACES TO BE CATHODICALLY PROTECTED, A LADDER HAVING METAL SIDE PIECES MADE OF A METAL WHICH IS GALVANICALLY SIMILAR TO THE SURFACE TO BE PROTECTED CONNECTED ELECTRICALLY AND MECHANICALLY TO THE SAID SURFACES, AND INCLUDING AT LEAST ONE GALVANIC ANODE AS A RUNG THEREOF, SAID GALVANIC ANODE BEING ELECTRICALLY AND MECHANICALLY CONNECTED TO THE SIDE PIECES.
Claim 2
Dependent Claim
66 words
A CATHODIC PROTECTION SYSTEM COMPRISING WIITH A TANK HAVING METAL SURFACES TO BE CATHODICALLY PROTECTED, A LADDER HAVING METAL SIDE PIECES MADE OF A METAL WHICH IS GALVANICALLY SIMILAR TO THE SURFACE TO BE PROTECTED CONNECTED ELECTRICALLY AND MECHANICALLY TO THE SAID SURFACES, AND INCLUDING AT LEAST ONE GALVANIC ANODE AS A RUNG THEREOF, SAID GALVANIC ANODE BEING ELECTRICALLY AND MECHANICALLY CONNECTED TO THE SIDE PIECES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-12 | 1961-02-11 | 1961-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-12 | 1965-02-11 | 1965-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-12 | 1969-02-11 | 1969-08-13 | $7700.00 | Window Closed / Lapsed |