Patent US3793975A successfully refreshed from Google Patents.
US3793975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced concrete boat hull
Assignee: Individual
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Filing: 1971-03-11
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Granted: 1974-02-26
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Expires: 1991-03-11
Abstract
Abstract A boat having a hull formed of a plurality of alternate, integrally bonded layers of a novel cementatious material and fiber-reinforced epoxy resin, and a method of constructing a concrete and fiber-reinforced epoxy resin boat hull are disclosed. The hull is a unitary structure comprised of a plurality of layers of the cementatious material having an integrally bonded layer of fiber-reinforced epoxy resin interspaced between adjacent layers of the cementatious material. The cementatious material is an admixture of hydraulic cement, aggregate, epoxy resin, water reducing additive, and sufficient water to harden the cement. Also, the hull can have an exterior resinous surface coating integrally bonded to it to enhance its appearance and serviceability.
Inventors
- 👤 R Duff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:11
CPC Classifications
B; B63; B63B; B63B5/00; B63B5/14; B63B5/16; B63B5/18; B63B5/20; B63B5/24; B63B2005/242
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
52 words
The article defined in claim 1 wherein said cementatious material is an admixture of 1 to 3 cubic feet of aggregate, 1/4 to 3 gallons of epoxy resin, 1 to 6 fluid ounces of liquid water reducing additive, and 4 to 6 gallons of water per 94 pound sack of hydraulic cement.
Claim 2
Dependent Claim
43 words
The article defined in claim 1 wherein said fiber-reinforced epoxy resin is epoxy resin reinforced with metal, plastic, cloth or glass mesh or screen; cloth, plastic or fiber glass matting; chopped cloth, plastic or fiber glass; or woven plastic or fiber glass roving.
Claim 3
Dependent Claim
37 words
The article defined in claim 1 wherein said structure is comprised of a plurality of layers of said cementatious material with an integrally bonded layer of fiber-reinforced epoxy resin interspaced between adjacent layers of said cementatious material.
Claim 4
Dependent Claim
26 words
The article defined in claim 1 wherein said structure is comprised of two layers of said cementatious material and a layer of fiber-reinforced epoxy resin therebetween.
Claim 5
Dependent Claim
23 words
The article defined in claim 1 wherein said epoxy resin is an admixture of diglycidyl ether of bisphenol A and a reactive hardener.
Claim 6
Dependent Claim
26 words
The article defined in claim 1 wherein said epoxy resin is an admixture of diglycidyl ether of bisphenol A, ortho-cresyl glycidyl ether and a reactive hardener.
Claim 7
Dependent Claim
18 words
The article defined in claim 1 wherein the exterior surface of said hull is coated with epoxy paint.
Claim 8
Dependent Claim
18 words
The article defined in claim 1 including a resinous surface coating bonded on the exterior of said structure.
Claim 9
Dependent Claim
63 words
A boat hull comprising a unitary, generally hollow-form, relatively thin-walled, buoyant structure comprised of a plurality of alternate layers of (1) a hardened cementatious material comprised of 1 to 3 cubic feet of aggregate, 1/4 to 3 gallons of epoxy resin, and 1 to 6 fluid ounces of water reducing additive per 94 pound sack of hydraulic cement, and (2) fiber-reinforced epoxy resin.
Claim 10
Dependent Claim
24 words
The article defined in claim 10 wherein said epoxy resin is an admixture of a diglycidyl ether of bisphenol A and a reactive hardener.
Claim 11
Dependent Claim
26 words
The article defined in claim 10 wherein said epoxy resin is an admixture of diglycidyl ether of bisphenol A, orthocresyl glycidyl ether and a reactive hardener.
Claim 12
Dependent Claim
23 words
The article defined in claim 10 wherein said water reducing agent is an admixture of hydroxylated polymer, calcium lignosulfonate and an organic accelerator.
Claim 13
Dependent Claim
18 words
The article defined in claim 10 including an integrally bonded exterior coating of polyester or epoxy gel coat.
Claim 14
Dependent Claim
115 words
A boat hull comprising a unitary, generally hollow-form, relatively thin-walled, buoyant structure comprised of a laminate consisting of an exterior layer of polyester or epoxy resin gel coat and alternate integrally bonded layers of fiber glass reinforced epoxy resin and a cementatious material consisting of an admixture of 1 to 3 cubic feet of aggregate; 1/4 to 3 gallons of epoxy resin comprising an admixture of diglycidyl ether of bisphenol A, ortho-cresyl glycidyl ether and reactive hardening agent; 1 to 6 fluid ounces of a water reducing additive comprised of an admixture of hydroxylated polymer, calcium lignosulfonate and an organic accelerator, and sufficient water to harden the cement per 94 pound sack of hydraulic cement.
Claim 15
Dependent Claim
52 words
The article defined in claim 15 wherein said cementatious material is an admixture of about 2 cubic feet of aggregate, 1/4 to 1 gallon of said epoxy resin; 2 to 4 fluid ounces of said water reducing agent, and about 4 to 6 gallons of water per 94 pound sack of cement.
Claim 16
Dependent Claim
47 words
The article defined in claim 15 including a deck at least partially covering said hull, said deck comprising a laminate consisting of an exterior layer of polyester or epoxy resin gel coat and alternate integrally bonded layers of fiber glass reinforced epoxy resin and said cementatious material.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |