Patent US4158031A successfully refreshed from Google Patents.
US4158031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically conductive foam mouldings
Assignee: Reuter Technologie GmbH
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Filing: 1977-03-28
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Granted: 1979-06-12
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Expires: 1997-03-28
Abstract
Abstract This invention relates to electrically conductive foam moulding manufactures from electrically conductive polystyrene beads containing blowing agent.
Inventors
- 👤 Franz G. Reuter
- 👤 Tankred Menzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:16
CPC Classifications
B; B65; B65D; B65D81/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
97 words
A process for making molded electrically conductive foam products which comprises heating polystyrene beads containing a blowing agent to expand the beads to form closed cell polystyrene foam particles, coating said particles by forming a mixture containing a film forming polyacrylate ester and a non-film forming polystyrene dispersion of carbon black whereby a non-continuous coating is produced, placing the partially coated particles in a mold and heating the mold's contents to about 105° C. until the prefoamed beads expand and develop a pressure of about 1 atmosphere gauge in the mold and the beads are welded together.
Claim 2
Dependent Claim
97 words
A process for making molded electrically conductive foam products which comprises heating polystyrene beads containing a blowing agent to expand the beads to form closed cell polystyrene foam particles, coating said particles by forming a mixture containing a film forming polyacrylate ester and a non-film forming polystyrene dispersion of carbon black whereby a non-continuous coating is produced, placing the partially coated particles in a mold and heating the mold's contents to about 105° C. until the prefoamed beads expand and develop a pressure of about 1 atmosphere gauge in the mold and the beads are welded together.
Claim 3
Dependent Claim
64 words
A process for making electrically conductive foam moldings which comprises mixing prefoamed polystyrene particles containing a blowing agent with an aqueous film forming polyacrylic ester dispension containing carbon black particles and expanding the resulting mixture in a mold to form a foam molding in which the said polystyrene particles are coated with electrically conductive particles and are welded together to form a foam molding.
Claim 4
Dependent Claim
64 words
A process for making electrically conductive foam moldings which comprises mixing prefoamed polystyrene particles containing a blowing agent with an aqueous film forming polyacrylic ester dispension containing carbon black particles and expanding the resulting mixture in a mold to form a foam molding in which the said polystyrene particles are coated with electrically conductive particles and are welded together to form a foam molding.
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) | 1982-06-11 | 1982-12-11 | 1983-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-11 | 1986-12-11 | 1987-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-11 | 1990-12-11 | 1991-06-12 | $7700.00 | Window Closed / Lapsed |