US5209760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection molded abrasive pad
Assignee: 3M Innovative Properties Co
•
Filing: 1991-07-18
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Granted: 1993-05-11
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Expires: 2011-07-18
Abstract
Abstract A one-piece abrasive sheet and method of manufacture. The abrasive pad has a planar sheet portion with a plurality abrasive protrusion extending therefrom. The protrusions are intimately molded with the planar sheet portion to form a one-piece sheet. Thermoplastic and abrasive grit mixture may be used to form the sheet by injection molding.
Inventors
- 👤 Ronald C. Wiand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:08
CPC Classifications
B; B24; B24B; B24B7/00; B24B7/20; B24B7/22; B24D; B24D11/00; B24D11/02; B24D18/00; B24D18/0009; B24D7/00; B24D7/02; B24D7/04; B24D9/00; B24D9/08; B24D9/085; B29; B29C; B29C45/00; B29C45/0013
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
62 words
A one-piece abrasive pad comprising: a flexible planar sheet portion having a plurality of abrasive protrusions extending therefrom, said pad being produced by injection molding such that said protrusions are intimately molded with said sheet portion from a single flexible material said material including an abrasive material interspersed homogeneously therethrough such that as the pad wears down, abrasive material will be exposed.
Claim 2
Dependent Claim
62 words
A one-piece abrasive pad comprising: a flexible planar sheet portion having a plurality of abrasive protrusions extending therefrom, said pad being produced by injection molding such that said protrusions are intimately molded with said sheet portion from a single flexible material said material including an abrasive material interspersed homogeneously therethrough such that as the pad wears down, abrasive material will be exposed.
Claim 3
Dependent Claim
15 words
The one-piece abrasive pad of claim 1 wherein said protrusions have a coplanar abrasive surfaces.
Claim 4
Dependent Claim
18 words
The one-piece abrasive pad of claim 1 further comprising a strengthening element integrally molded within said sheet portion.
Claim 5
Dependent Claim
28 words
The one-piece abrasive pad of claim 1 further comprising a phenolic board backing material molded in-situ with said pad for providing a strengthening element for said sheet portion.
Claim 6
Dependent Claim
14 words
The one-piece abrasive pad of claim 1 wherein said material is a thermoplastic material.
Claim 7
Dependent Claim
78 words
A process of manufacture of an abrasive sheet comprising the steps of: a) providing an injection mold structure having a series of concavities therein for forming a pad shaped with abrasive protrusions extending therefrom; b) formulating a mixture of thermoplastic material and an abrasive grit material for injection molding of an abrasive pad with abrasive grit homogeneously dispersed therethrough; and c) injection molding an abrasive pad by forcing said mixture into said concavities for forming the abrasive sheet.
Claim 8
Dependent Claim
78 words
A process of manufacture of an abrasive sheet comprising the steps of: a) providing an injection mold structure having a series of concavities therein for forming a pad shaped with abrasive protrusions extending therefrom; b) formulating a mixture of thermoplastic material and an abrasive grit material for injection molding of an abrasive pad with abrasive grit homogeneously dispersed therethrough; and c) injection molding an abrasive pad by forcing said mixture into said concavities for forming the abrasive sheet.
Claim 9
Dependent Claim
37 words
The process of claim 6 wherein a pad substrate informulated with a first abrasive free thermoplastic and said protrusions are attached thereto by injection molding of a thermoplastic and abrasive grit mixture to the abrasive free substrate.
Claim 10
Dependent Claim
13 words
The process of claim 6 wherein said thermoplastic further comprises a polypropylene material.
Claim 11
Dependent Claim
13 words
The process of claim 7 wherein said thermoplastic further comprises a polypropylene material.
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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) | 1996-05-10 | 1996-11-09 | 1997-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-10 | 2000-11-09 | 2001-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-10 | 2004-11-09 | 2005-05-11 | $7700.00 | Window Closed / Lapsed |