US4088623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coatings that reduce flow resistance and turbulent drag at their interface with liquids
Assignee: United States Department of the Navy
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Filing: 1976-06-28
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Granted: 1978-05-09
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Expires: 1996-06-28
Abstract
Abstract Coating formulations and method of making thereof for reducing the drag orriction encountered at the interface of a soluble drag reduction material coating and the liquid medium such as water in which the coating is being used. This is accomplished by adding various solid water-soluble materials as diluents and viscosity reducers, to a very high molecular weight drag reduction non-ionic polymer such as that of polyethylene oxide. The molded polymer with the added solid water-soluble material has less solubility and viscosity at and contiguous to the coating-water interface than that of the additive-free matrix under similar conditions.
Inventors
- 👤 Harry A. Pearl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:52
CPC Classifications
C; C09; C09D; C09D171/00; C09D171/02; C08; C08K; C08K3/00; C08K3/30; C08K5/00; C08K5/36; C08K5/37; C08L; C08L71/00; C08L71/02; Y; Y02; Y02T; Y02T70/00; Y02T70/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
100 words
A molded coating formulation for covering the outer surface of a body moving in water to reduce the drag encountered at and contiguous to the interface thereof, said coating formulation consisting essentially of 96 parts by weight polyethylene oxide polymer powder of molecular weight 4 × 10 6 ; 15 parts by weight polyethylene oxide polymer powder of molecular weight 9 × 10 5 ; 9 parts by weight 4.8 percent by weight solution of 4,4" thio-bis (6-tert-butyl meta cresol) in polyoxyalkylene sorbitan monolaurate of theoretical molecular weight 1226; and 120 parts by weight of a neutral water soluble salt.
Claim 2
Dependent Claim
100 words
A molded coating formulation for covering the outer surface of a body moving in water to reduce the drag encountered at and contiguous to the interface thereof, said coating formulation consisting essentially of 96 parts by weight polyethylene oxide polymer powder of molecular weight 4 × 10 6 ; 15 parts by weight polyethylene oxide polymer powder of molecular weight 9 × 10 5 ; 9 parts by weight 4.8 percent by weight solution of 4,4" thio-bis (6-tert-butyl meta cresol) in polyoxyalkylene sorbitan monolaurate of theoretical molecular weight 1226; and 120 parts by weight of a neutral water soluble salt.
Claim 3
Dependent Claim
17 words
The molded coating of claim 1 wherein said water soluble salt is K 2 SO 4 .
Claim 4
Independent Claim
129 words
A method of making a molded coating for reducing the drag encountered by a moving body in water at and contiguous to the interface, said method comprising the steps of: mixing uniformly 96 parts by weight of polyethylene oxide polymer powder of molecular weight 4 × 10 6 , 15 parts by weight polyethylene oxide polymer powder of molecular weight 5 × 10 5 , 9 parts by weight 48 percent solution of 4,4' thio-bis (6-tert-butyl) meta cresol) in polyoxyalkylene sorbitan monolaurate of theoretical molecular weight 1226 and 120 parts by weight of K 2 S0 4 to form a mixture; distributing uniformly said mixture in a mold cell; heating said mixture in said mold cell to 250° F under pressure of 580 psi; and cooling said mold cell.
Claim 5
Independent Claim
129 words
A method of making a molded coating for reducing the drag encountered by a moving body in water at and contiguous to the interface, said method comprising the steps of: mixing uniformly 96 parts by weight of polyethylene oxide polymer powder of molecular weight 4 × 10 6 , 15 parts by weight polyethylene oxide polymer powder of molecular weight 5 × 10 5 , 9 parts by weight 48 percent solution of 4,4' thio-bis (6-tert-butyl) meta cresol) in polyoxyalkylene sorbitan monolaurate of theoretical molecular weight 1226 and 120 parts by weight of K 2 S0 4 to form a mixture; distributing uniformly said mixture in a mold cell; heating said mixture in said mold cell to 250° F under pressure of 580 psi; and cooling said mold cell.
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) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |