Patent US4904280A successfully refreshed from Google Patents.
US4904280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conditioning block for sharpening stones
Assignee: Saint Gobain Abrasives Inc
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Filing: 1988-07-18
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Granted: 1990-02-27
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Expires: 2008-07-18
Abstract
Abstract A product and process for reconditioning abrasive stones used to sharpen metal tools such as woodworking tools. The product is a slab made up of abrasive grain bond with an organic polymer.
Inventors
- 👤 Stanley W. Cygan
- 👤 Muni S. Ramakrishnan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:35
CPC Classifications
B; B24; B24D; B24D3/00; B24D3/02; B24D3/20; B24D3/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
52 words
A porous slab for reconditioning cutting tool sharpening stones comprising abrasive grain and a foamed organic polymer bond therefor, said porous slab having an amount of porosity of from 40% to 80%, said abrasive grain having a grit size of from about 46 to about 220 based on U.S. Standard Sieve Series.
Claim 2
Dependent Claim
52 words
A porous slab for reconditioning cutting tool sharpening stones comprising abrasive grain and a foamed organic polymer bond therefor, said porous slab having an amount of porosity of from 40% to 80%, said abrasive grain having a grit size of from about 46 to about 220 based on U.S. Standard Sieve Series.
Claim 3
Dependent Claim
26 words
The porous slab of claim 1 wherein said organic polymer bond is one selected form the group consisting of polyurethane, polyvinyl chloride, polyethylene, polyester, and epoxy.
Claim 4
Dependent Claim
42 words
The porous slab of claim 2 wherein said abrasive grain is one selected from the group consisting of silicon carbide, sand, garnet, flint boron carbide, silicon nitride, fused alumina, sintered alumina, cofused alumina-zirconia, sintered alumina-zirconia, cubic boron nitride, diamond, and mixtures thereof.
Claim 5
Dependent Claim
20 words
The porous slab of claim 3 wherein said foamed organic polymer bond contains 1-30% of a filler and/or grinding aid.
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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) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |