Patent US3341924A successfully refreshed from Google Patents.
Patent US4714644A successfully refreshed from Google Patents.
US4714644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sanding pad
Assignee: 3M Co
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Filing: 1986-12-30
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Granted: 1987-12-22
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Expires: 2006-12-30
Abstract
Abstract A sanding pad particularly useful for simultaneously intersecting surfaces that form sanding inside or outside corners. The pad comprises a stiff rectangular backing sheet having through slits along closely spaced parallel lines, with the slits along each line forming most of the line and being spaced by a plurality of unslit parts of the sheet. A coating of abrasive granules is adhered along a first surface of the sheet, and a layer of resiliently compressible foam is adhered on and coextensive with a second surface of the backing sheet which affords bending the backing sheet at about a right angle along one of the lines to deform the foam adjacent the line about which said sheet is bent while retaining in generally planar condition the two portions of the sheet on opposite sides of the line about which the sheet is bent.
Inventors
- 👤 Larry D. Rich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:28
CPC Classifications
B; B24; B24D; B24D15/00; B24D15/04; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24298; Y10T428/24314; Y10T428/24322; Y10T428/24331; Y10T428/24355; Y10T428/24372; Y10T428/25
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
145 words
A sanding pad particularly useful for simultaneously sanding intersecting surfaces at a corner, said pad comprising: a rectangular backing sheet having first and second surfaces and having through slits along closely spaced parallel lines, with said slits along each line forming most of said line and being spaced by a plurality of unslit parts of said sheet; a coating of abrasive granules adhered along said first surface; and a layer of resiliently compressible foam adhered on and coextensive with the second surface of said backing sheet, said foam having sufficiently low density to afford bending said backing sheet at about a right angle along one of said lines to deform said foam adjacent the line about which said sheet is bent while retaining in generally planar condition the two portions of said sheet on opposite sides of the line about which the sheet is bent.
Claim 2
Dependent Claim
145 words
A sanding pad particularly useful for simultaneously sanding intersecting surfaces at a corner, said pad comprising: a rectangular backing sheet having first and second surfaces and having through slits along closely spaced parallel lines, with said slits along each line forming most of said line and being spaced by a plurality of unslit parts of said sheet; a coating of abrasive granules adhered along said first surface; and a layer of resiliently compressible foam adhered on and coextensive with the second surface of said backing sheet, said foam having sufficiently low density to afford bending said backing sheet at about a right angle along one of said lines to deform said foam adjacent the line about which said sheet is bent while retaining in generally planar condition the two portions of said sheet on opposite sides of the line about which the sheet is bent.
Claim 3
Dependent Claim
50 words
A sanding pad according to claim 1 wherein said lines are spaced at about 0.48 centimeter apart, each of said slits is about 1.9 centimeter long, and said unslit parts of said sheet separating said slits along each of said lines are about 0.33 centimeter in length along said lines.
Claim 4
Dependent Claim
33 words
A sanding pad according to claim 1 wherein said backing sheet is of cloth, and said foam is an open cell polyurethane having a density of about 24 kilograms pounds per cubic meter.
Claim 5
Dependent Claim
140 words
A sanding pad particularly useful for simultaneously sanding intersecting surfaces at a corner, said pad comprising: a rectangular backing sheet having first and second surfaces and having through slits along at least one line across said sheet, with said slits along said line forming most of said line and being spaced by a plurality of unslit parts of said sheet; a coating of abrasive granules adhered along said first surface; and a layer of resiliently compressible foam adhered on and coextensive with the second surface of said backing sheet, said foam having sufficiently low density to afford bending said backing sheet at about a right angle along said line to deform said foam adjacent the line while retaining in generally planar condition the two portions of said sheet on opposite sides of the line about which the sheet is bent.
Claim 6
Dependent Claim
140 words
A sanding pad particularly useful for simultaneously sanding intersecting surfaces at a corner, said pad comprising: a rectangular backing sheet having first and second surfaces and having through slits along at least one line across said sheet, with said slits along said line forming most of said line and being spaced by a plurality of unslit parts of said sheet; a coating of abrasive granules adhered along said first surface; and a layer of resiliently compressible foam adhered on and coextensive with the second surface of said backing sheet, said foam having sufficiently low density to afford bending said backing sheet at about a right angle along said line to deform said foam adjacent the line while retaining in generally planar condition the two portions of said sheet on opposite sides of the line about which the sheet is bent.
Claim 7
Dependent Claim
39 words
A sanding pad according to claim 4 wherein each of said slits is about 1.9 centimeter long, and said unslit parts of said sheet separating said slits along said lines are about 0.33 centimeter in length along said line.
Claim 8
Dependent Claim
33 words
A sanding pad according to claim 4 wherein said backing sheet is of cloth, and said foam is an open cell polyurethane having a density of about 24 kilograms pounds per cubic meter.
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) | 1990-12-21 | 1991-06-22 | 1991-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-21 | 1995-06-22 | 1995-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-21 | 1999-06-22 | 1999-12-22 | $7700.00 | Window Closed / Lapsed |