Patent DE42492C successfully refreshed from Google Patents.
Patent US4241682A successfully refreshed from Google Patents.
US4241682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solutions of polyethylenimine or a hydrophilic derivative thereof and a hydrophilic acrylic polymer and watercraft coated below the waterline therewith
Assignee: Individual
•
Filing: 1974-10-07
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Granted: 1980-12-30
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Expires: 1994-10-07
Abstract
Abstract Solutions of polyethylenimine or a hydrophilic derivative thereof and a hydrophilic acrylic polymer for coating watercraft below the waterline. The coating results in reduced drag by the water on the watercraft as it travels through the water. The coating also acts as a glaze coating which protects and increases the life of paint on the surfaces over which it is coated.
Inventors
- 👤 Felix Konstandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:33
CPC Classifications
B; B63; B63B; B63B1/00; B63B1/32; B63B1/34; Y; Y02; Y02T; Y02T70/00; Y02T70/10; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31525; Y10T428/31529; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906; Y10T428/31942; Y10T428/31949; Y10T428/31957
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
48 words
A watercraft having below its water line a coating comprising a mixture of a hydrophilic acrylic polymer and hydroxyethylated polyethylenimine prepared by reacting polyethylenimine of molecular weight 40,000 to 60,000 with ethylene oxide in a weight ratio of the polyethylenimine to the ethylene oxide of 1:0.1 to 1:1.
Claim 2
Dependent Claim
48 words
A watercraft having below its water line a coating comprising a mixture of a hydrophilic acrylic polymer and hydroxyethylated polyethylenimine prepared by reacting polyethylenimine of molecular weight 40,000 to 60,000 with ethylene oxide in a weight ratio of the polyethylenimine to the ethylene oxide of 1:0.1 to 1:1.
Claim 3
Dependent Claim
30 words
A watercraft according to claim 1, in which the coating further comprises an epoxy resin, multivalent metal salt or formaldehyde resin reacted with the acrylic resin to provide cross linkage.
Claim 4
Dependent Claim
54 words
A watercraft according to claim 1, in which the acrylic polymer comprises a copolymer of at least one alkyl acrylate or methacrylate, in which the alkyl is of up to 4 carbon atoms and acrylic acid in such proportion that carboxyl groups constitute about 5 to about 10 percent by weight of the copolymer.
Claim 5
Dependent Claim
19 words
A watercraft according to claim 3, in which the copolymer is of molecular weight about 5,000 to about 300,000.
Claim 6
Dependent Claim
47 words
A watercraft having below its waterline a coating comprising a mixture of a hydrophilic acrylic polymer and propoxylated polyethylenimine prepared by reacting polyethylenimine of molecular weight 40,000 to 60,000 with propylene oxide in a weight ratio of the polyethylenimine to the propylene oxide of 1:0.1 to 1:1.1.
Claim 7
Dependent Claim
47 words
A watercraft having below its waterline a coating comprising a mixture of a hydrophilic acrylic polymer and propoxylated polyethylenimine prepared by reacting polyethylenimine of molecular weight 40,000 to 60,000 with propylene oxide in a weight ratio of the polyethylenimine to the propylene oxide of 1:0.1 to 1:1.1.
Claim 8
Dependent Claim
30 words
A watercraft according to claim 5, in which the coating further comprises an epoxy resin, multivalent metal salt or formaldehyde resin reacted with the acrylic resin to provide cross linkage.
Claim 9
Dependent Claim
52 words
A watercraft according to claim 5, in which the acrylic polymer comprises a copolymer of at least one alkyl acrylate or methacrylate, in which the alkyl is up to 4 carbon atoms and acrylic acid in such proporation that carboxyl groups constitute about 5 to about 10% by weight of the copolymer.
Claim 10
Dependent Claim
19 words
A watercraft according to claim 7, in which the copolymer is of molecular weight about 5,000 to about 300,000.
Claim 11
Dependent Claim
39 words
A watercraft having below its waterline a coating comprising a mixture of a hydrophilic acrylic polymer and epichlorohydrin modified polyethylenimine prepared by reacting polyethylenimine of molecular weight 20,000 to 50,000 with epichlorohydrin in a weight ratio of about 1:1.
Claim 12
Dependent Claim
39 words
A watercraft having below its waterline a coating comprising a mixture of a hydrophilic acrylic polymer and epichlorohydrin modified polyethylenimine prepared by reacting polyethylenimine of molecular weight 20,000 to 50,000 with epichlorohydrin in a weight ratio of about 1:1.
Claim 13
Dependent Claim
30 words
A watercraft according to claim 9, in which the coating further comprises an epoxy resin, multivalent metal salt or formaldehyde resin reacted with the acrylic resin to provide cross linkage.
Claim 14
Dependent Claim
52 words
A watercraft according to claim 9, in which the acrylic polymer comprises a copolymer of at least one alkyl acrylate or methacrylate, in which the alkyl is up to 4 carbon atoms and acrylic acid in such proportion that carboxyl groups constitute about 5 to about 10% by weight of the copolymer.
Claim 15
Dependent Claim
19 words
A watercraft according to claim 11, in which the copolymer is of molecular weight about 5,000 to about 300,000.
Claim 16
Dependent Claim
39 words
A watercraft having below its waterline a coating comprising a mixture of a hydrophilic acrylic polymer and urea modified polyethylenimine prepared by reacting polyethylenimine of molecular weight 1,000 to 60,000 with urea in a weight ratio of about 1:1.
Claim 17
Dependent Claim
39 words
A watercraft having below its waterline a coating comprising a mixture of a hydrophilic acrylic polymer and urea modified polyethylenimine prepared by reacting polyethylenimine of molecular weight 1,000 to 60,000 with urea in a weight ratio of about 1:1.
Claim 18
Dependent Claim
30 words
A watercraft according to claim 13, in which the coating further comprises an epoxy resin, multivalent metal salt or formaldehyde resin reacted with the acrylic resin to provide cross linkage.
Claim 19
Dependent Claim
52 words
A watercraft according to claim 13, in which the acrylic polymer comprises a copolymer of at least one alkyl acrylate or methacrylate, in which the alkyl is up to 4 carbon atoms and acrylic acid in such proportion that carboxyl groups constitute about 5 to about 10% by weight of the copolymer.
Claim 20
Dependent Claim
19 words
A watercraft according to claim 13, in which the copolymer is of molecular weight about 5,000 to about 300,000.
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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) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |