US4831074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic composite and the process for manufactring the same
Assignee: Kishimoto Sangyo Co Ltd
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Filing: 1988-04-15
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Granted: 1989-05-16
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Expires: 2008-04-15
Abstract
Abstract The present invention is directed to a high specific gravity composite giving high-strength, rustproofing, and aesthetic products. The plastic composite is composed of 50-95 weight percent of glassy powder comprising 80 weight percent or more of lead monoxide (PbO) having particle size under 150 mesh, with balanced amount of resin and reinforcement.
Inventors
- 👤 Takeshi Moriwaki
- 👤 Kenji Tsutsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:42
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/40; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/252
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
60 words
High-density and high strength plastic composite having a specific gravity of 3.0 or more, composed of about 10-50 weight % of a thermoplastic polymer and 50-90 weight percent of lead glass powder comprising 80 weight percent or more of lead monoxide (PbO) and 16 weight percent or less of silicic anhydride (SiO 2 ), with particle size under 150 mesh.
Claim 2
Dependent Claim
60 words
High-density and high strength plastic composite having a specific gravity of 3.0 or more, composed of about 10-50 weight % of a thermoplastic polymer and 50-90 weight percent of lead glass powder comprising 80 weight percent or more of lead monoxide (PbO) and 16 weight percent or less of silicic anhydride (SiO 2 ), with particle size under 150 mesh.
Claim 3
Dependent Claim
40 words
High-density and high strength plastic composite as defined in claim 1, composed of 50-90 weight percent of glassy powder comprising 80 weight percent or more of lead monoxide (PbO), surface treated with coupling agents, with particle size under 150 mesh.
Claim 4
Dependent Claim
56 words
High-density and high strength plastic composite as defined in claim 1, where the composite is composed of; 50-90 weight percent of glassy powder comprising 80 weight percent or more of lead monoxide and surface treated with coupling agent, with particle size under 150 mesh, 1-40 weight percent of glass fiber; 5-50 weight percent of thermoplastic material.
Claim 5
Dependent Claim
57 words
High-density and high strength plastic composite as defined in claim 1, where the composite is composed of; 50-90 weight percent of glassy powder comprising 80 weight percent or more of lead monoxide and surface treated with coupling agent, with particle size under 150 mesh, 1-40 weight percent of inorganic fibrous filler, 5-50 weight percent of thermoplastic material.
References Cited (Backward Citations)
US4254010A
Cited
US4533680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |