Patent US4812247A successfully refreshed from Google Patents.
US4812247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastics moulding containing reinforced fillings
Assignee: Lanxess Deutschland GmbH
•
Filing: 1986-08-11
•
Granted: 1989-03-14
•
Expires: 2006-08-11
Abstract
Abstract By means of a piston-like movement, solid fillings, for example of mineral fibers or steel wool, introduced in the pressureless zone of a screw are incorporated in the molten plastic and the resulting mixture formed in a mold. The finished molding contains numerous fillings greater than 2 mm in length which inter alia contribute significantly towards improving its strength.
Inventors
- 👤 Karsten Fahner
- 👤 Friedrich Johannaber
- 👤 Hans-Werner Depcik
- 👤 Axel Kaminski
- 👤 Rudiger Van Hooren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:25
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/80; B29B7/88; B29B7/90; B29B7/30; B29B7/58; B29B7/60; B29C; B29C45/00; B29C45/0005; B29K; B29K2311/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/298; Y10T428/31504; Y10T428/31551; Y10T428/31634; Y10T428/31638
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
138 words
An injection molded plastic article containing solid fillings which consist essentially of lubricate-free fillings wherein more than 30% by weight of which have a minimum length of greater than 4 mm said fillings selected from the group consisting of carbon, aramide, asbestos, metal, glass and mineral fibers and said plastic article being produced by a process in which lubricant-free fillings are introduced into a screw in an injection molding apparatus in a region, where the plastic is in a plasticized form and the pressures are nearly the same, and are then incorporated by shearing, characterized in that shearing of the fillings of fiber-like, thread-like, ribbon-like or sheet-form materials and their incorporation into the plastic is intensified by a piston-like movement of the screw, after which the plastic is injected into a closed mold by means of a piston.
Claim 2
Dependent Claim
138 words
An injection molded plastic article containing solid fillings which consist essentially of lubricate-free fillings wherein more than 30% by weight of which have a minimum length of greater than 4 mm said fillings selected from the group consisting of carbon, aramide, asbestos, metal, glass and mineral fibers and said plastic article being produced by a process in which lubricant-free fillings are introduced into a screw in an injection molding apparatus in a region, where the plastic is in a plasticized form and the pressures are nearly the same, and are then incorporated by shearing, characterized in that shearing of the fillings of fiber-like, thread-like, ribbon-like or sheet-form materials and their incorporation into the plastic is intensified by a piston-like movement of the screw, after which the plastic is injected into a closed mold by means of a piston.
Claim 3
Dependent Claim
16 words
A molding as claimed in claim 1 wherein the fillings are at least partly electrically conductive.
Claim 4
Dependent Claim
20 words
A molding as claimed in claim 2, wherein the electrically conductive fillings are connected with one another as resistance wires.
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) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |