Patent US4154888A successfully refreshed from Google Patents.
US4154888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rigid composite articles
Assignee: Individual
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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 17:09
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.
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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) | 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 |