Patent US4893439A successfully refreshed from Google Patents.
US4893439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasive article containing helically crimped fibers
Assignee: 3M Co
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Filing: 1988-08-05
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Granted: 1990-01-16
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Expires: 2008-08-05
Abstract
Abstract Abrasive article comprising an open, lofty nonwoven web comprising helically crimped synthetic organic fibers. The article can optionally contain stuffer box crimped fibers and melt bondable fibers. The presence of helically crimped fibers brings about greater durability and greater capacity for absorbing debris.
Inventors
- 👤 Thomas R. McAvoy
- 👤 Fred H. Bland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:46
CPC Classifications
B; B24; B24D; B24D11/00; B24D11/001; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2925
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
43 words
An article suitable for buffing floors consisting of an open, lofty nonwoven web comprising at least 30% by weight of helically crimped, synthetic, organic, staple fibers, said web containing a binder and abrasive particles ranging in grade from about 36 to about 1000.
Claim 2
Dependent Claim
43 words
An article suitable for buffing floors consisting of an open, lofty nonwoven web comprising at least 30% by weight of helically crimped, synthetic, organic, staple fibers, said web containing a binder and abrasive particles ranging in grade from about 36 to about 1000.
Claim 3
Dependent Claim
18 words
The article of claim 1 wherein the web comprises at least 50% by weight of helically crimped fibers.
Claim 4
Dependent Claim
18 words
The article of claim 1 wherein the web comprises at least 70% by weight of helically crimped fibers.
Claim 5
Dependent Claim
13 words
The article of claim 1 wherein said web further comprises melt bondable fibers.
Claim 6
Dependent Claim
14 words
The article of claim 1 wherein said web further comprises stuffer box crimped fibers.
Claim 7
Dependent Claim
12 words
The article of claim 1 wherein said helically crimped fibers are stabilized.
Claim 8
Dependent Claim
21 words
The article of claim 1 wherein said helically crimped fibers have from about 1 to about 15 crimps per 25 mm.
Claim 9
Dependent Claim
20 words
The article of claim 1 wherein said helically crimped fibers have a crimp index from about 35% to about 70%.
Claim 10
Dependent Claim
13 words
The article of claim 1 wherein said helically crimped fibers comprise polyethylene terephthalate.
Claim 11
Dependent Claim
12 words
The article of claim 1 wherein said helically crimped fibers comprise nylon.
Claim 12
Dependent Claim
12 words
The article of claim 1 wherein said helically crimped fibers comprise polyester.
Claim 13
Dependent Claim
19 words
The article of claim 1 wherein said fibers range from about 60 mm to about 150 mm in length.
Claim 14
Dependent Claim
83 words
An article suitable for buffing floors consisting of an open, lofty nonwoven web comprising at least 30% by weight of helically crimped, synthetic, organic, staple fibers, said web containing a binder and abrasive particles ranging in grade from about 36 to about 1000, wherein said helically crimped fibers are stabilized, have from about 1 to about 15 crimps per 25 mm, have a crimp index from about 35% to about 70%, and range from about 60 mm to about 150 mm in length.
Claim 15
Dependent Claim
83 words
An article suitable for buffing floors consisting of an open, lofty nonwoven web comprising at least 30% by weight of helically crimped, synthetic, organic, staple fibers, said web containing a binder and abrasive particles ranging in grade from about 36 to about 1000, wherein said helically crimped fibers are stabilized, have from about 1 to about 15 crimps per 25 mm, have a crimp index from about 35% to about 70%, and range from about 60 mm to about 150 mm in length.
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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) | 1993-01-15 | 1993-07-17 | 1994-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-15 | 1997-07-17 | 1998-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-15 | 2001-07-17 | 2002-01-16 | $7700.00 | Window Closed / Lapsed |