Patent US4286988A successfully refreshed from Google Patents.
US4286988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper base antifouling paints with pH control
Assignee: United States Department of the Navy
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Filing: 1980-06-30
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Granted: 1981-09-01
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Expires: 2000-06-30
Abstract
Abstract Conventional Copper based antifouling paints are improved by adding from 0.001 to 20.0 weight percent based on the weight of the Cuprous ion source of an additive compound which (A) will give a positive acid test to litmus paper in distilled water; (B) is at least slightly soluble in sea water; and (C) does not react quickly with cuprous ions in sea water to produce precipitates.
Inventors
- 👤 Vincent J. Castelli
- 👤 Eugene C. Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:18
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/16; C09D5/1606; C09D5/1612; C09D5/1618
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
41 words
In a copper base antifouling paint containing a film-forming vehicle and a cuprous source as the toxic agent, the improvement comprising 0.001 to 20 weight percent of (NH 4 ) 2 SO 4 based upon the weight of the cuprous source.
Claim 2
Dependent Claim
41 words
In a copper base antifouling paint containing a film-forming vehicle and a cuprous source as the toxic agent, the improvement comprising 0.001 to 20 weight percent of (NH 4 ) 2 SO 4 based upon the weight of the cuprous source.
Claim 3
Dependent Claim
14 words
The antifouling paint of claim 1 wherein the cuprous source is Cu 2 O.
Claim 4
Dependent Claim
29 words
The antifouling paint of claim 1 containing from 0.01 to 8 weight percent of (NH 4 ) 2 SO 4 based upon the weight percent of the cuprous source.
Claim 5
Dependent Claim
21 words
The antifouling paint of claim 3 containing from 0.03 to 4 weight percent of (NH 4 ) 2 SO 4 .
Claim 6
Dependent Claim
21 words
The antifouling paint of claim 4 containing from 0.1 to 2 weight percent of (NH 4 ) 2 SO 4 .
Claim 7
Dependent Claim
28 words
The antifouling paint of claim 2 containing from 0.01 to 8 weight percent of (NH 4 ) 2 SO 4 based upon the weight of Cu 2 O.
Claim 8
Dependent Claim
21 words
The antifouling paint of claim 6 containing from 0.03 to 4 weight percent of (NH 4 ) 2 SO 4 .
Claim 9
Dependent Claim
21 words
The antifouling paint of claim 7 containing from 0.1 to 2 weight percent of (NH 4 ) 2 SO 4 .
Claim 10
Dependent Claim
14 words
The antifouling paint of claim 1 wherein the cuprous source comprises Cu 2 S.
Claim 11
Dependent Claim
28 words
The antifouling paint of claim 9 containing from 0.01 to 8 weight percent of (NH 4 ) 2 SO 4 based on the weight of Cu 2 S.
Claim 12
Dependent Claim
21 words
The antifouling paint of claim 10 containing from 0.03 to 4 weight percent of (NH 4 ) 2 SO 4 .
Claim 13
Dependent Claim
21 words
The antifouling paint of claim 11 containing from 0.1 to 2 weight percent of (NH 4 ) 2 SO 4 .
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) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |