Patent US4731199A successfully refreshed from Google Patents.
US4731199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultra high molecular weight concurrently sintered and cross-linked polyethylene product
Assignee: Mitsuboshi Belting Ltd
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Filing: 1986-06-26
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Granted: 1988-03-15
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Expires: 2006-06-26
Abstract
Abstract The invention is a concurrently sintered and cross-linked ram extruded product formed by a mixture of an ultra high molecular weight polyethylene powder with a cross-linking agent, an electrically conductive agent and a lubricant. As little as 0.5 parts per 100 parts of polyethylene of the electrically conductive agent added to the ultra high molecular weight polyethylene powder coats the power to provide adequate conductivity without adversely affecting the mechanical properties of the product.
Inventors
- 👤 Tadao Matsuo
- 👤 Fumio Matsuoka
- 👤 Nobuo Yokota
- 👤 Masaaki Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:05
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/88; B29C70/882; B29C48/00; B29C48/022; B29C48/03; B29C48/06; B29C48/09; B29C48/25; B29C48/36; B29C48/475; B29C37/00; B29C2037/92; B29C48/04; B29C48/10; B29C48/12; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2105/00; B29K2105/06; B29K2105/16; B29K2105/24; B29K2105/25; B29K2105/251; B29K2995/00; B29K2995/0003; B29K2995/0005; B29K2995/0037; B29K2995/0088; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
75 words
A concurrently sintered and cross-linked ram extruded product comprising a mixture of ultra high molecular weight polyethylene powder, a cross-linking agent, an electrically conductive agent selected from the group consisting of conductive carbon black, metallic oxide, and metallic powder, and a lubricant, said product having a transverse dimensional deviation of less than approximately 2 mm., said electrically conductive agent being present in the amount of 0.5 wt. parts per 100 parts of said polyethylene powder.
Claim 2
Dependent Claim
75 words
A concurrently sintered and cross-linked ram extruded product comprising a mixture of ultra high molecular weight polyethylene powder, a cross-linking agent, an electrically conductive agent selected from the group consisting of conductive carbon black, metallic oxide, and metallic powder, and a lubricant, said product having a transverse dimensional deviation of less than approximately 2 mm., said electrically conductive agent being present in the amount of 0.5 wt. parts per 100 parts of said polyethylene powder.
Claim 3
Dependent Claim
64 words
A concurrently sintered and cross-linked ram extruded product comprising a mixture of ultra high molecular weight polyethylene powder, a cross-linking agent, an electrically conductive agent, and a lubricant, said electrically conductive agent comprising zinc oxide provided in an amount between 15 to 50 wt. parts per 100 wt. parts polyethylene powder, said product having a transverse dimensional deviation of less than approximately 2 mm.
Claim 4
Dependent Claim
64 words
A concurrently sintered and cross-linked ram extruded product comprising a mixture of ultra high molecular weight polyethylene powder, a cross-linking agent, an electrically conductive agent, and a lubricant, said electrically conductive agent comprising zinc oxide provided in an amount between 15 to 50 wt. parts per 100 wt. parts polyethylene powder, said product having a transverse dimensional deviation of less than approximately 2 mm.
Claim 5
Dependent Claim
31 words
The ultra high molecular weight polyethylene product of claim 2 wherein said electrically conductive agent is present in the amount of 15 wt. parts per 100 parts of said polyethylene powder.
Claim 6
Dependent Claim
33 words
The ultra high molecular weight polyethylene product of claim 2 wherein said electrically conductive agent is present in the amount of 15 to 20 wt. parts per 100 parts of said polyethylene powder.
Claim 7
Dependent Claim
17 words
The concurrently sintered, cross-linked ram extruded product of claim 2 wherein said metallic oxide comprises aluminum oxide.
Claim 8
Dependent Claim
17 words
The concurrently sintered, cross-linked ram extruded product of claim 2 wherein said metallic oxide comprises indium oxide.
Claim 9
Dependent Claim
17 words
The concurrently sintered, cross-linked ram extruded product of claim 2 wherein said metallic oxide comprises potassium oxide.
Claim 10
Dependent Claim
33 words
The concurrently sintered, cross-linked ram extruded product of claim 2 wherein said electrically conductive agent comprises aluminum oxide present in the amount of 15 wt. parts per 100 parts of said polyethylene powder.
Claim 11
Dependent Claim
33 words
The concurrently sintered cross-linked ram extruded product of claim 2 wherein said electrically conductive agent comprises aluminum oxide present in the amount of 22.5 wt. parts per 100 parts of said poyethylene powder.
Claim 12
Dependent Claim
14 words
The concurrently sintered cross-linked ram extruded product of claim 2 further including a filler.
Claim 13
Dependent Claim
14 words
The concurrently sintered cross-linked ram extruded product of claim 2 further including coloring material.
Claim 14
Dependent Claim
15 words
The concurrently sintered cross-linked ram extruded product of claim 2 further including pastel coloring material.
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) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |