Patent US3864234A successfully refreshed from Google Patents.
US3864234A
Expired / Lapsed
US
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Cathodic Protection System for Water Heaters with Sealant
Assignee: AOS Holding Co
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Filing: 1973-05-08
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Granted: 1975-02-04
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Expires: 1993-05-08
Abstract
Abstract A cathodically protected lined water heater tank in which zinc rich paint is employed between the tank of the water heater and fittings, threaded or otherwise secured to the tank. The zinc rich paint acts as a distributed or secondary anode to charge exposed metal at the location of the paint with a protective potential against corrosion and also as a sealant which increases in volume for increased sealing effect when products of corrosion are produced as the zinc rich paint reacts with the water in the water heater. The zinc rich paint is used in combination with a primary zinc anode extending within the fluid stored in the water heater.
Inventors
- 👤 Loerwood C Wasson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:01
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02; F; F16; F16B; F16B2200/00; F16B2200/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
34 words
The cathodically protected tank of claim 1, in which the sealant material is a zinc rich paint having fine particles of solid zinc of an approximate size to pass through a 300 mesh sieve.
Claim 2
Dependent Claim
15 words
The cathodically protected tank of claim 2 in which the primary anode is of zinc.
Claim 3
Dependent Claim
19 words
The cathodically protected tank of claim 1 in which some of the fittings are threaded into the tank wall.
Claim 4
Dependent Claim
19 words
The cathodically protected tank of claim 1 in which some of the fittings are bolted to the tank wall.
References Cited (Backward Citations)
US1646736A
Cited
US2423290A
Cited
US2459123A
Cited
US2941935A
Cited
US3332867A
Cited
US3354063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |