US4991362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hand scouring pad
Assignee: 3M Co
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Filing: 1988-09-13
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Granted: 1991-02-12
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Expires: 2008-09-13
Abstract
Abstract A low-density nonwoven abrasive pad, especially suited for use as a scouring article, formed of a multiplicity of continuous, crimped thermoplastic organic filaments having one end of substantially all of the filaments bonded together at one end of the pad and the opposite end of substantially all of the filaments bonded together at the opposite end of the pad. The abrasive pad is made by arranging the filaments into an open lofty array, bonding substantially all of the filaments together at a first and second bond site, and then cutting the array at the bond sites such that each bond is divided into at least two bond area segments with each bond area segment having the filament array bonded therein in a unitary structure.
Inventors
- 👤 Raymond F. Heyer
- 👤 Connie L. Hubbard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:08
CPC Classifications
D; D01; D01G; D01G99/00; A; A47; A47L; A47L13/00; A47L13/10; A47L13/16; A47L17/00; A47L17/04; A47L17/08; B; B29; B29C; B29C65/00; B29C65/02; B29C65/08; B29C66/00; B29C66/69; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/83; B29C66/832; B29C66/8322; B29C66/71; B29C66/83221
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
185 words
A method of making a scouring article, comprising the steps of: (a) arranging a multiplicity of continuous, crimped or undulated, thermoplastic, organic filaments into an open lofty array with one point of each filament in said array corresponding to a first filament bonding site and a second point of each filament, distant from said first point, corresponding to a second filament bonding site; (b) bonding substantially all of said thermoplastic organic filaments together at said first and said second bonding sites to respectively provide a first bond area comprising bonded filaments and a second bond area comprising bonded filaments, said bond areas being of a size sufficient to permit division thereof into at least two bond area segments per bond area with each bond area segment having said filament array bonded therein in a unitary structure; and (c) dividing each of said first and said second bond areas into at least two bond area segments, each bond area segment having said filament array bonded therein in a unitary structure, by cutting said filament array within said bond areas to provide an open, lofty, nonwoven pad.
Claim 2
Independent Claim
185 words
A method of making a scouring article, comprising the steps of: (a) arranging a multiplicity of continuous, crimped or undulated, thermoplastic, organic filaments into an open lofty array with one point of each filament in said array corresponding to a first filament bonding site and a second point of each filament, distant from said first point, corresponding to a second filament bonding site; (b) bonding substantially all of said thermoplastic organic filaments together at said first and said second bonding sites to respectively provide a first bond area comprising bonded filaments and a second bond area comprising bonded filaments, said bond areas being of a size sufficient to permit division thereof into at least two bond area segments per bond area with each bond area segment having said filament array bonded therein in a unitary structure; and (c) dividing each of said first and said second bond areas into at least two bond area segments, each bond area segment having said filament array bonded therein in a unitary structure, by cutting said filament array within said bond areas to provide an open, lofty, nonwoven pad.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein said step of arranging organic filaments into an open lofty array comprises opening a substantially continuous length of crimped tow.
Claim 4
Dependent Claim
25 words
The method of claim 1 wherein said step of bonding substantially all of said thermoplastic organic filaments together comprises melt-fusing said filaments together with heat.
Claim 5
Dependent Claim
13 words
The method of claim 3 wherein said melt-fusing is by ultrasonic sound waves.
Claim 6
Dependent Claim
67 words
The method of claim 1 further comprising the additional steps of: (d) coating said array of thermoplastic filaments, at least between said bond areas, with a liquid, curable thermosetting adhesive binder material; (e) depositing a multitude of abrasive particles throughout the adhesive binder coated thermoplastic filament array; and (f) curing said liquid, curable adhesive binder material to bond said abrasive particles to said array of thermoplastic filaments.
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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) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |