US4962618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens lapping pad
Assignee: J&S Wylde Ltd
•
Filing: 1990-01-19
•
Granted: 1990-10-16
•
Expires: 2010-01-19
Abstract
Abstract A lens lapping pad comprising a zinc alloy foil having a thickness of about 0.1 mm, and a backing of cloth impregnated with a pressure sensitive adhesive, to give an overall pad thickness of about 0.5 mm. A peelable cover may protect the cloth backing.
Inventors
- 👤 Stephen J. Wylde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:09
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/01; Y; Y10; Y10S; Y10S451/00; Y10S451/921
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
148 words
A lens lapping pad comprising a metal foil having a thickness substantially in the range from 0.07 mm to 0.13 mm, and a tool-adherable backing of cloth impregnated with a pressure sensitive adhesive, to give an overall pad thickness substantially in the range from 0.35 mm to 0.60 mm, in which the cloth has one of its sides firmly attached to the metal foil by means of adhesive, and in which pressure sensitive adhesive is present on the other side of the cloth, being the side further from the metal foil, by means of which the pad may be removably attached to the working surface of a lens lapping tool with the cloth between the tool and the metal foil, and in which the pad is continuous across at least one diameter thereof, being substantially equal to the diameter of the working surface of a lens lapping tool.
Claim 2
Dependent Claim
148 words
A lens lapping pad comprising a metal foil having a thickness substantially in the range from 0.07 mm to 0.13 mm, and a tool-adherable backing of cloth impregnated with a pressure sensitive adhesive, to give an overall pad thickness substantially in the range from 0.35 mm to 0.60 mm, in which the cloth has one of its sides firmly attached to the metal foil by means of adhesive, and in which pressure sensitive adhesive is present on the other side of the cloth, being the side further from the metal foil, by means of which the pad may be removably attached to the working surface of a lens lapping tool with the cloth between the tool and the metal foil, and in which the pad is continuous across at least one diameter thereof, being substantially equal to the diameter of the working surface of a lens lapping tool.
Claim 3
Dependent Claim
18 words
A pad according to claim 1, in which the metal foil has a thickness of substantially 0.1 mm.
Claim 4
Dependent Claim
18 words
A pad according to claim 1, in which the pad has an overall thickness of substantially 0.5 mm.
Claim 5
Dependent Claim
18 words
A pad according to claim 1, having a diameter substantially in the range from 50 to 150 mm.
Claim 6
Dependent Claim
13 words
A pad according to claim 4, having a diameter of substantially 75 mm.
Claim 7
Dependent Claim
14 words
A pad according to claim 1, in which the cloth backing comprises cotton cloth.
Claim 8
Dependent Claim
21 words
A pad according to claim 1, in which the cloth backing is impregnated with a natural rubber based pressure sensitive adhesive.
Claim 9
Dependent Claim
24 words
A pad according to claim 1, in which the cloth backing is impregnated with a pressure sensitive adhesive on both sides of the backing.
Claim 10
Dependent Claim
15 words
A pad according to claim 1, in which said metal foil comprises a zinc alloy.
Claim 11
Dependent Claim
17 words
A pad according to claim 9, in which the alloy is made with zinc of 99.95% purity.
Claim 12
Dependent Claim
45 words
A pad according to claim 9, in which the zinc alloy comprises copper substantially in the range 0.7 to 0.85% by weight, titanium substantially in the range from 0.1 to 0.12% by weight, and manganese substantially in the range from 0.1 to 0.12% by weight.
Claim 13
Dependent Claim
37 words
A pad according to claim 11, in which impurities are controlled to 0.005% by weight maximum for lead, 0.003% by weight maximum for cadmium, 0.01% by weight maximum for iron, and 0.002% by weight maximum for tin.
Claim 14
Dependent Claim
25 words
A pad according to claim 1, which is provided with a plurality of radially extending slots which are open at the periphery of the pad.
Claim 15
Dependent Claim
17 words
A pad according to claim 1, in which the cloth backing is protected by a peelable cover.
Claim 16
Dependent Claim
28 words
A lens lapping assembly comprising a lapping tool and a pad as claimed in claim 1 laid on and conforming to a working surface of the lapping tool.
Claim 17
Dependent Claim
90 words
A lens lapping pad comprising a zinc alloy foil having a thickness substantially in the range from 0.07 mm to 0.13 mm, and a tool-adhesive backing of cloth impregnated with a pressure sensitive adhesive, to give an overall pad thickness substantially in the range from 0.35 mm to 0.60 mm, in which the zinc alloy comprises copper substantially in the range from 0.7 to 0.85% by weight, titanium substantially in the range from 0.1 to 0.12% by weight, and manganese substantially in a range from 0.1 to 0.12% by weight.
Claim 18
Dependent Claim
90 words
A lens lapping pad comprising a zinc alloy foil having a thickness substantially in the range from 0.07 mm to 0.13 mm, and a tool-adhesive backing of cloth impregnated with a pressure sensitive adhesive, to give an overall pad thickness substantially in the range from 0.35 mm to 0.60 mm, in which the zinc alloy comprises copper substantially in the range from 0.7 to 0.85% by weight, titanium substantially in the range from 0.1 to 0.12% by weight, and manganese substantially in a range from 0.1 to 0.12% by weight.
Claim 19
Dependent Claim
37 words
A pad according to claim 16, in which impurities are controlled to 0.005% by weight maximum for lead, 0.003% by weight maximum for cadmium, 0.01% by weight maximum for iron, and 0.002% by weight maximum for tin.
References Cited (Backward Citations)
US369431A
Cited
US2752738A
Cited
US3144737A
Cited
US3324608A
Cited
US4019289A
Cited
US4162899A
Cited
US4086068A
Cited
US4274232A
Cited
GB2039810A
Cited
US4555250A
Cited
US4644703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-15 | 1994-04-16 | 1994-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-15 | 1998-04-16 | 1998-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-15 | 2002-04-16 | 2002-10-16 | $7700.00 | Window Closed / Lapsed |