US5238739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasive filaments and production process thereof
Assignee: Kureha Corp
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Filing: 1991-06-26
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Granted: 1993-08-24
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Expires: 2011-06-26
Abstract
Abstract Abrasive filaments made of a composition which comprises 95-70 vol. % of a polyvinylidene fluoride resin, whose inherent viscosity (η inh ) ranges from 0.9 to 1.4, and 5-30 vol. % of abrasive grains. They are produced by melt-spinning the composition and then stretching the resultant filaments at a draw ratio of 2.5 times-5.5 times within a temperature range of 100°-200° C.
Inventors
- 👤 Tomoo Susa
- 👤 Seiichi Ohira
- 👤 Hiroyuki Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:35
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/08; D01F6/12; D01F1/00; D01F1/02; D01F1/10; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2927; Y10T428/2973
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
Abrasive filaments obtained by melt-spinning a composition composed of 90-80 vol. % of a polyvinylidene fluorine resin, whose inherent viscosity (η inh ) ranges from 1.0 to 1.3, and whose melting point ranges from 165° C. to 185° C., and 10-20 vol. % of abrasive grains to form resulting filaments and then stretching said resultant filaments at a draw ratio of 2.5-5.5 times so as to form abrasive filaments having a diameter of 0.1-3 mm.
Claim 2
Dependent Claim
75 words
Abrasive filaments obtained by melt-spinning a composition composed of 90-80 vol. % of a polyvinylidene fluorine resin, whose inherent viscosity (η inh ) ranges from 1.0 to 1.3, and whose melting point ranges from 165° C. to 185° C., and 10-20 vol. % of abrasive grains to form resulting filaments and then stretching said resultant filaments at a draw ratio of 2.5-5.5 times so as to form abrasive filaments having a diameter of 0.1-3 mm.
Claim 3
Dependent Claim
20 words
The abrasive filaments as claimed in claim 1, wherein said abrasive grains are substantially uniformly distributed throughout said abrasive filaments.
Claim 4
Dependent Claim
15 words
The abrasive filaments as claimed in claim 1, wherein each filament has a circular cross-section.
Claim 5
Dependent Claim
15 words
The abrasive filaments as claimed in claim 1, wherein each filament has an oval-shaped cross-section.
Claim 6
Dependent Claim
15 words
The abrasive filaments as claimed in claim 1, wherein each filament has a triangular cross-section.
Claim 7
Dependent Claim
15 words
The abrasive filaments as claimed in claim 1, wherein each filament has a rectangular cross-section.
References Cited (Backward Citations)
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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) | 1996-08-23 | 1997-02-22 | 1997-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-23 | 2001-02-22 | 2001-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-23 | 2005-02-22 | 2005-08-24 | $7700.00 | Window Closed / Lapsed |