US4154888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rigid composite articles
Assignee: Individual
•
Filing: 1977-12-07
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Granted: 1979-05-15
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Expires: 1997-12-07
Abstract
Abstract Rigid composite articles comprising a relatively thin, impression-retaining surface formed of a hard, rigid, room-temperature cured urethane resin and a relatively thick backing and reinforcing are made by casting a thin layer of urethane resin on the surface of a master, curing the urethane, then casting thereon a relatively thick backing layer of a casting material such as plaster or resin.
Inventors
- 👤 Frank Dewey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:13
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/38; B29C33/3842; B29C33/3857; B29C33/40; B29C33/56; B29K; B29K2875/00; Y; Y10; Y10S; Y10S428/00; Y10S428/908; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24983; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/25; Y10T428/254; Y10T428/259; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/31504; Y10T428/31511; Y10T428/31525; Y10T428/31551; Y10T428/31554; Y10T428/31598
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
85 words
A rigid composite article comprising an outer impression retaining thin rigid surface layer from about 0.0675 inches to about 0.250 inches in thickness, said rigid surface layer being formed of a rigid cured urethane having a Shore durometer hardness of from about 65D to about 90D, and a relatively thick backing layer formed of a cast material comprising a filler selected from the group consisting of mineral fibers and glass fibers and a resin selected from the group consisting of epoxy resin and urethane resin.
Claim 2
Dependent Claim
85 words
A rigid composite article comprising an outer impression retaining thin rigid surface layer from about 0.0675 inches to about 0.250 inches in thickness, said rigid surface layer being formed of a rigid cured urethane having a Shore durometer hardness of from about 65D to about 90D, and a relatively thick backing layer formed of a cast material comprising a filler selected from the group consisting of mineral fibers and glass fibers and a resin selected from the group consisting of epoxy resin and urethane resin.
Claim 3
Dependent Claim
23 words
The rigid composite article of claim 1 further comprising a layer of epoxy resin adhesive between said surface layer and said backing layer.
Claim 4
Dependent Claim
57 words
A rigid composite article comprising an outer impression retaining thin rigid surface layer from about 0.0675 inches to about 0.250 inches in thickness, said rigid surface layer being formed of a rigid cured urethane having a Shore durometer hardness of from about 65D to about 90D, and a relatively thick backing layer formed of plaster of paris.
Claim 5
Dependent Claim
57 words
A rigid composite article comprising an outer impression retaining thin rigid surface layer from about 0.0675 inches to about 0.250 inches in thickness, said rigid surface layer being formed of a rigid cured urethane having a Shore durometer hardness of from about 65D to about 90D, and a relatively thick backing layer formed of plaster of paris.
Claim 6
Dependent Claim
23 words
The rigid composite article of claim 3 further comprising a layer of epoxy resin adhesive between said surface layer and said backing layer.
References Cited (Backward Citations)
US3276947A
Cited
US3300370A
Cited
US4061815A
Cited
US3668058A
Cited
US4017556A
Cited
US4018941A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-14 | 1982-11-13 | 1983-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-14 | 1986-11-13 | 1987-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-14 | 1990-11-13 | 1991-05-15 | $7700.00 | Window Closed / Lapsed |