US3921344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens surfacing pads and method of making the same
Assignee: American Optical Corp
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Filing: 1973-05-14
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Granted: 1975-11-25
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Expires: 1993-05-14
Abstract
Abstract Lens surfacing pads of foraminous material having a continuous puncture resistant thermoplastic film on one side only. The film is applied to the pads by lamination under heat and pressure and supports a layer of adhesive for attaching the foraminous pads to lens surfacing tools.
Inventors
- 👤 Bertram R Goodwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:51
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/04; B32B7/06; B24; B24B; B24B13/00; B24B13/01; B32B27/00; B32B27/12; B32B3/00; B32B3/26; B32B3/266; B32B5/00; B32B5/02; B32B5/024; B32B7/12; B32B2307/00; B32B2307/50; B32B2307/554
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
110 words
A disposable lens surfacing pad comprising the laminate of: a sheet of foraminous material; a thin, imperforate film of highly abrasion and puncture resistant material sealed to one side only of said sheet of foraminous material, the opposite side of said sheet being fully exposed for direct contact with a lens to be surfaced; and a layer of adhesive on said film for detachably securing said pad to said rigid lens surfacing tool as a tool facing; whereby said film component of said laminate prevents the material of said adhesive from penetrating said sheet of foraminous material and contaminating a lens placed thereagainst under pressure for surfacing by said tool.
Claim 2
Dependent Claim
110 words
A disposable lens surfacing pad comprising the laminate of: a sheet of foraminous material; a thin, imperforate film of highly abrasion and puncture resistant material sealed to one side only of said sheet of foraminous material, the opposite side of said sheet being fully exposed for direct contact with a lens to be surfaced; and a layer of adhesive on said film for detachably securing said pad to said rigid lens surfacing tool as a tool facing; whereby said film component of said laminate prevents the material of said adhesive from penetrating said sheet of foraminous material and contaminating a lens placed thereagainst under pressure for surfacing by said tool.
Claim 3
Dependent Claim
16 words
A disposable lens surfacing pad according to claim 1 wherein said film is a thermoplastic resin.
Claim 4
Dependent Claim
21 words
A disposable lens surfacing pad according to claim 2 wherein said sheet of foraminous material is a screen of woven wire.
Claim 5
Dependent Claim
19 words
A disposable lens surfacing pad according to claim 2 wherein said foraminous material is a sheet of woven fibers.
Claim 6
Dependent Claim
19 words
A disposable lens surfacing pad according to cLaim 2 wherein said foraminous material is a perforated sheet of metal.
Claim 7
Dependent Claim
19 words
A disposable lens surfacing pad according to claim 2 wherein said foraminous material is a perforated sheet of plastic.
Claim 8
Dependent Claim
16 words
A disposable lens surfacing pad according to claim 2 wherein said foraminous material is perforated foil.
Claim 9
Dependent Claim
21 words
A disposable lens surfacing pad according to claim 1 wherein said layer of adhesive comprises a sheet of double-faced pressure-sensitive tape.
Claim 10
Dependent Claim
166 words
A lens surfacing tool comprising: a rigid main body adaptable to lens surfacing machines, one side of said body having a surface curvature substantially corresponding to a curvature desired to be produced upon a lens intended to be worked by said tool; a disposable lens surfacing pad detachably secured to said surface of said tool as a facing, said pad comprising the laminate of a sheet of foraminous material, a thin, imperforate film of highly abrasive and puncture resistant material heat sealed to one side only of said sheet of foraminous material, the opposite side of said sheet being fully exposed for direct contact with a lens to be surfaced and a layer of adhesive on said film for detachably securing said pad to said surface of said tool as a tool facing whereby said film component of said laminate prevents the material of said adhesive from penetrating said sheet of foraminous material and contaminating a lens placed thereagainst under pressure for surfacing by said tool.
Claim 11
Dependent Claim
166 words
A lens surfacing tool comprising: a rigid main body adaptable to lens surfacing machines, one side of said body having a surface curvature substantially corresponding to a curvature desired to be produced upon a lens intended to be worked by said tool; a disposable lens surfacing pad detachably secured to said surface of said tool as a facing, said pad comprising the laminate of a sheet of foraminous material, a thin, imperforate film of highly abrasive and puncture resistant material heat sealed to one side only of said sheet of foraminous material, the opposite side of said sheet being fully exposed for direct contact with a lens to be surfaced and a layer of adhesive on said film for detachably securing said pad to said surface of said tool as a tool facing whereby said film component of said laminate prevents the material of said adhesive from penetrating said sheet of foraminous material and contaminating a lens placed thereagainst under pressure for surfacing by said tool.
Claim 12
Dependent Claim
30 words
A lens surfacing tool according to claim 9 wherein said foraminous material is a screen and said thin film of highly abrasion and puncture resistant material is a thermoplastic resin.
Claim 13
Dependent Claim
31 words
A lens surfacing tool according to claim 9 wherein said foraminous material is a perforate sheeting and said film of said highly abrasion and puncture resistant material is a thermoplastic resin.
Claim 14
Independent Claim
100 words
The method of making a disposable lens surfacing pad comprising the steps of: bringing a sheet of foraminous material and a thin, imperforate film of highly abrasion and puncture resistant material flatly into side-by-side relationship with each other; heating the combination of said sheet of foraminous material and film and pressing the combination together at a temperature and with a pressure suitable for effecting a bond therebetween to attach said film to one side only of said sheet of foraminous material, leaving an opposite side of said sheet fully exposed; and applying a layer of adhesive material to said film.
Claim 15
Independent Claim
100 words
The method of making a disposable lens surfacing pad comprising the steps of: bringing a sheet of foraminous material and a thin, imperforate film of highly abrasion and puncture resistant material flatly into side-by-side relationship with each other; heating the combination of said sheet of foraminous material and film and pressing the combination together at a temperature and with a pressure suitable for effecting a bond therebetween to attach said film to one side only of said sheet of foraminous material, leaving an opposite side of said sheet fully exposed; and applying a layer of adhesive material to said film.
Claim 16
Dependent Claim
34 words
The method according to claim 12 wherein said film is a thermoplastic resin and said temperature and pressure suitable for effecting said bonds are approximately 275*F and approximately 4,000 pounds per square inch respectively.
Claim 17
Dependent Claim
21 words
The method according to claim 12 further including the step of applying a readily removable protective cover over said adhesive material.
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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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |