Patent US5054668A successfully refreshed from Google Patents.
Patent US3896753A successfully refreshed from Google Patents.
US3896753A
Expired / Lapsed
US
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Hydrophilic polymer coating for underwater structures
Assignee: National Patent Development Corp
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Filing: 1971-01-14
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Granted: 1975-07-29
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Expires: 1991-01-14
Abstract
Abstract Hydrophilic polymers are applied to the underwater portions of surfaces which move through water or surfaces against which water is flowing in order to reduce drag.
Inventors
- 👤 Thomas H Shepherd
- 👤 Francis E Gould
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:14
CPC Classifications
C; C09; C09D; C09D101/00; C09D101/08; C09D101/10; C09D101/12; C08; C08F; C08F20/00; C08F20/62; C09D4/00; C09D5/00; C09D5/16; C09D5/1656; C09D5/1662; C09D5/1668; Y; Y02; Y02T; Y02T70/00; Y02T70/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
83 words
A MARINE STRUCTURE WHICH IS A WATERCRAFT HAVING AN ADHERENT CONTINUOUS EXPOSED COATING CONSISTING ESSENTIALLY OF A MEMBER OF THE GROUP CONSISTING OF (1) A WATER INSOLUBLE HYDROPHILIC POLYMER WHICH IS SWELLABLE TO AN EXTENT OF AT LEAST 10% IN WATER AND CONTAINS VINYL PYRROLIDONE UNITS, WHEREIN SAID VINYL PYRROLIDONE UNITS CONTRIBUTE SIGNIFICANTLY TO THE WATER SWELLABILITY, WHEREIN THE COATING IS SUFFICIENT TO REDUCE THE DRAG OF THE WATERCRAFT WHEN IN WATER AND, (2) SAID HYDROPHILIC POLYMER HAVING RELEASABLY ENTRAPPED THEREIN AT LEAST
Claim 2
Dependent Claim
83 words
A MARINE STRUCTURE WHICH IS A WATERCRAFT HAVING AN ADHERENT CONTINUOUS EXPOSED COATING CONSISTING ESSENTIALLY OF A MEMBER OF THE GROUP CONSISTING OF (1) A WATER INSOLUBLE HYDROPHILIC POLYMER WHICH IS SWELLABLE TO AN EXTENT OF AT LEAST 10% IN WATER AND CONTAINS VINYL PYRROLIDONE UNITS, WHEREIN SAID VINYL PYRROLIDONE UNITS CONTRIBUTE SIGNIFICANTLY TO THE WATER SWELLABILITY, WHEREIN THE COATING IS SUFFICIENT TO REDUCE THE DRAG OF THE WATERCRAFT WHEN IN WATER AND, (2) SAID HYDROPHILIC POLYMER HAVING RELEASABLY ENTRAPPED THEREIN AT LEAST
Claim 3
Dependent Claim
23 words
A marine structure according to claim 1 including a minor amount up to 20% by weight of the polymer of a cross-linking agent.
Claim 4
Dependent Claim
22 words
A marine structure according to claim 1 wherein the hydrophilic polymer is swellable to an extent of at least 20% in water.
Claim 5
Dependent Claim
21 words
A marine structure according to claim 1 wherein the coating is a film having a thickness of 0.3 to 5 mils.
Claim 6
Dependent Claim
38 words
A marine structure aCcording to claim 4 wherein underneath said exposed coating is an inner coating comprising an anti-foulant, said hydrophilic film coating being antifoulant free and sufficiently water absorbable to permit water to reach said anti-foulant coating.
Claim 7
Dependent Claim
25 words
A marine structure according to claim 1 wherein the hydrophilic polymer is normally water soluble but has been cross-linked sufficiently to render it water insoluble.
Claim 8
Dependent Claim
15 words
A marine structure according to claim 1 wherein the polymer is water insolubilized polyvinyl pyrrolidone.
Claim 9
Dependent Claim
17 words
A marine structure according to claim 1 wherein the coating has releasably entrapped therein an anti-fouling agent.
Claim 10
Dependent Claim
21 words
A marine structure according to claim 8 wherein the coating is a film having a thickness of 0.3 to 5 mils.
Claim 11
Dependent Claim
25 words
A marine structure according to claim 8 wherein the hydrophilic polymer is normally water soluble, but has been cross-linked sufficiently to render it water insoluble.
Claim 12
Dependent Claim
15 words
A marine structure according to claim 8 wherein the polymer is water insolubilized polyvinyl pyrrolidone.
Claim 13
Dependent Claim
22 words
A marine structure according to claim 1 wherein the hydrophilic polymer is swellable to an extent of 20 to 120% in water.
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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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |