US3784357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective surfaces or liners for subaqueous structures
Assignee: United States Department of the Navy
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Filing: 1972-01-13
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Granted: 1974-01-08
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Expires: 1992-01-13
Abstract
Abstract A concrete slab or a tubular concrete pipe is provided with a wall surface or liner to protect the concrete member from marinefouling organisms. The surface or liner incorporates an expanded shale aggregate, which aggregate has been impregnated with chemicals toxic to marine organisms. The toxic material will leach out very slowly over a long period to provide the desired protection. Such protective surfaces or liners are readily removable and can easily be replaced when the toxic chemicals are completely leached out.
Inventors
- 👤 J Muraoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:53
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/10; C04B20/1018; C04B20/1029; C04B24/00; C04B28/00; C04B28/02; E; E02; E02D; E02D31/00; E02D31/06; C04B2103/00; C04B2103/60; C04B2103/67; C04B2111/00; C04B2111/76
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
31 words
The subaqueous structure as defined in claim 1 wherein the chemical is selected from the group consisting of bis-(tri-n-butyltin) oxide, copper naphthenate, cupreous oxide, copper-8-quinolinate, pentachlorophenol, copper sulfate, and aniline green.
Claim 2
Dependent Claim
42 words
The subaqueous structure as defined in claim 1 wherein the creosote comprises 89 percent by weight of the mixture and the chemical comprises 11 percent by weight of bis(tri-n-butyltin) oxide, 1 percent by weight pentachlorophenol and 0.2 percent by weight aniline green.
Claim 3
Dependent Claim
23 words
The subaqueous structure as defined in claim 2 wherein the high porosity expanded shale aggregates are between 1/4 to 3/8 inch in diameter.
Claim 4
Dependent Claim
102 words
A concrete member for attachment to an underwater pipe in order to prevent fouling marine growth from accumulating thereon comprising: a concrete liner being about 1 to 2 inches in thickness and shaped to conform to the configuration of the pipe to which said liner is attaChed; said concrete liner characterized by having incorporated therein a high porosity expanded shale aggregate with said aggregates being between 1/4 to 3/8 inch in diameter and saturated with a mixture of creosote oil and other chemicals toxic to fouling marine growth, said chemicals selected from the group consisting of bis(tri-n-butyltin) oxide, pentachlorophenol, and analine green.
Claim 5
Dependent Claim
134 words
A concrete member for attachment to an underwater wall in order to prevent fouling marine growth from accumulating thereon comprising: a concrete slab being about 1 to 2 inches in thickness and shaped to conform to the configuration of the wall to which said slab is attached; said concrete slab characterized by having incorporated therein a high porosity expanded shale aggregate with said aggregates being between 1/4 to 3/8 inch in diameter and impregnated with a mixture of creosote oil and other chemicals toxic to fouling marine growth, said chemicals selected from the group consisting of bis(tri-n-butyltin) oxide, pentachlorophenol and analine green, said creosote being present in the mixture by about 85 to 90 percent by weight and the toxic chemicals being present in the mixture by about 10 to 15 percent by weight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |