US4274232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction grip pad
Assignee: 3M Co
•
Filing: 1978-07-07
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Granted: 1981-06-23
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Expires: 1998-07-07
Abstract
Abstract For application to the working surface of a tool for grinding, lapping or polishing optical lenses; a base pad comprising a flexible carrier layer, an adhesive film on one side of the carrier layer by which the pad can be adhered to the working surface of the tool, and a friction-grip surface on the other side of the carrier layer adapted to frictionally grip the lower surface of a lens-working pad applied to it whereby the use of an adhesive between the two pads is avoided.
Inventors
- 👤 Stephen J. Wylde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:59
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/01; Y; Y10; Y10S; Y10S451/00; Y10S451/921
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
161 words
A tool for working on the surface of an optical lens comprising a base having a curved working surface, a base pad having an abrasive coated surface composed of a layer of binder material in which is distributed grains of hard mineral material and a mounting surface opposite said abrasive coated surface, adhesive means for bonding said base pad to said curved working surface, and a working pad laid on and conforming to the abrasive coated surface of said base pad, said working pad having a first surface means adapted for working on a lens surface and a second relatively soft surface means, opposite said first surface means, to frictionally engage with said abrasive coated surface, said abrasive coated surface being sufficiently rough to frictionally engage with said second surface means and being the sole means to retain said working pad on said tool while said tool curved surface is being urged against the surface of a lens being worked on.
Claim 2
Dependent Claim
161 words
A tool for working on the surface of an optical lens comprising a base having a curved working surface, a base pad having an abrasive coated surface composed of a layer of binder material in which is distributed grains of hard mineral material and a mounting surface opposite said abrasive coated surface, adhesive means for bonding said base pad to said curved working surface, and a working pad laid on and conforming to the abrasive coated surface of said base pad, said working pad having a first surface means adapted for working on a lens surface and a second relatively soft surface means, opposite said first surface means, to frictionally engage with said abrasive coated surface, said abrasive coated surface being sufficiently rough to frictionally engage with said second surface means and being the sole means to retain said working pad on said tool while said tool curved surface is being urged against the surface of a lens being worked on.
Claim 3
Dependent Claim
35 words
The tool of claim 1 wherein said base pad is adherently bonded to said curved working surface by means of a layer of adhesive on the surface of said base pad opposite said abrasive surface.
Claim 4
Dependent Claim
20 words
A tool according to claim 1, in which said base pad includes a flexible carrier layer comprised of wettable paper.
Claim 5
Dependent Claim
19 words
A tool according to claim 1, in which said coated abrasive surface is formed of silicon carbide abrasive particles.
Claim 6
Dependent Claim
21 words
A tool according to claim 1, in which the base pad includes a flexible carrier layer comprised of soft aluminum foil.
Claim 7
Dependent Claim
32 words
A tool according to claim 1, wherein said base pad has slots cut in it from its peripheral edge whereby the pad may conform precisely to the working surface of the tool.
References Cited (Backward Citations)
US2732065A
Cited
US2286208A
Cited
US3144737A
Cited
US3225497A
Cited
US3583111A
Cited
US3959935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-22 | 1984-12-22 | 1985-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-22 | 1988-12-22 | 1989-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-22 | 1992-12-22 | 1993-06-23 | $7700.00 | Window Closed / Lapsed |