US3650795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete form surfacing
Assignee: JOHN H WILLINGHAM
•
Filing: 1969-01-27
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Granted: 1972-03-21
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Expires: 1989-01-27
Abstract
Abstract There is disclosed herein a method for preparation and construction of concrete pouring forms in which the surfaces and edges of the form members are treated with several coats of a resinous material exhibiting particularly advantageous mechanical and chemical properties. A preferred material is a moisture cured urethane prepolymer solution.
Inventors
- 👤 John H Willingham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:15
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/36; B28B7/364; B28B7/38; E; E04; E04G; E04G9/00; E04G9/02; E04G2009/023; E04G2009/026; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/239; Y10T428/31504; Y10T428/31551; Y10T428/31554; Y10T428/31591
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
12 words
The method of claim 1 wherein the wooden core member is plywood.
Claim 2
Dependent Claim
26 words
The method of claim 1 wherein the solvent is at least one member selected of the group consisting of xylene and ethylene glycol monoethyl ether acetate.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein the curing period is from 3 to 4 hours in relative humidity of greater than 50 percent.
Claim 4
Independent Claim
221 words
A method of making a rigid form member with a cured, single component, resin coated exterior for a concrete pouring form having surface characteristics of tensile strength of at least 2, 000 to 5,000 p.s.i., hardness (Sward) between about 30 and 60, impact resistance (Gardner) of at least about 140 in. lbs. direct and reverse, and Taber Abrasion (CS10 wheel, 1,000 grams, 1,000 cycles) maximum weight loss of less than 75 milligrams which comprises: providing a core member having a preselected shape and dimensional configuration, said core comprising steel, wood, or fiberglass; applying a first coating to all surfaces of said core member, said coating consisting of a moisture curable, isocyanate-terminated, urethane prepolymer in a solvent having a solids concentration of approximately 50 percent of the solids concentration of subsequently applied coatings and a viscosity (Brookfield) of less than approximately 150 c.p.s. exposing said coated surfaces to ambient atmospheric moisture for a period sufficient to cure said coating; subsequently applying at least one additional coating to all surfaces of said member; said additional coating consisting of the said urethane prepolymer in a solvent having a solids concentration of about 30 percent to about 40 percent and a viscosity (Brookfield) of approximately 150 c.p.s. successively exposing said additionally coated surface to ambient atmospheric moisture for a period sufficient to cure said coating.
Claim 5
Dependent Claim
26 words
The method of claim 5 wherein the solvent is at least one member selected from the group consisting of xylene and ethylene glycol monoethyl ether acetate.
Claim 6
Dependent Claim
24 words
The method of claim 5 wherein the curing period is from 3 to 4 hours in relative humidity not greater than about 50 percent.
References Cited (Backward Citations)
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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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |