US3959935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasive pad for grinding lenses
Assignee: INTEROPTIC LABS Inc
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Filing: 1975-03-18
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Granted: 1976-06-01
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Expires: 1995-03-18
Abstract
Abstract A pad for grinding lens blanks comprising a pliable sheet of a water-proof material (e.g., paper or fabric) with an adhesive coating on one side thereof for adhering onto a working surface. An abrasive substance (e.g., silicon carbide) is applied to the pad and a plurality of radially extending channels are cut through its area to provide a smooth fit over a working surface.
Inventors
- 👤 Waldemar Stoppacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:58
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/01; Y; Y10; Y10S; Y10S451/00; Y10S451/921
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
101 words
A pad for grinding lens blanks comprising a relatively porous and substantially water-resistant pliable sheet adapted to conform to the curved surface of a working tool, an adhesive coating on the underside of said pad for adhesively securing said pad to the surface of said tool and an abrasive surface on the other side thereof, a plurality of radially extending channels cut through the area of said pad, said radially extending channels being defined by parallel radial sides extending from the periphery of said pad toward the center thereof and an arched segment joining the inner ends of said radial sides.
Claim 2
Dependent Claim
101 words
A pad for grinding lens blanks comprising a relatively porous and substantially water-resistant pliable sheet adapted to conform to the curved surface of a working tool, an adhesive coating on the underside of said pad for adhesively securing said pad to the surface of said tool and an abrasive surface on the other side thereof, a plurality of radially extending channels cut through the area of said pad, said radially extending channels being defined by parallel radial sides extending from the periphery of said pad toward the center thereof and an arched segment joining the inner ends of said radial sides.
Claim 3
Dependent Claim
27 words
A pad as in claim 1 wherein said arched segment is of generally circular configuration having a diameter larger than the width of said radially extending channel.
References Cited (Backward Citations)
US2286208A
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US2309836A
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US2607174A
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US2701191A
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US3144737A
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US3267623A
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US3324608A
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US3583111A
Cited
US3699721A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |