US4400089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for determining optical quality of an article
Assignee: PPG Industries Inc
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Filing: 1981-01-16
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Granted: 1983-08-23
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Expires: 2001-01-16
Abstract
Abstract An interlayer material is scanned prior to laminating same with glass sheets to generate a thickness variation signal, a wedge angle signal and an optical power signal. The signals are then selectively filtered to determine the thickness variation, wedge angle and optical power of the interlayer after lamination.
Inventors
- 👤 Aloysius W. Farabaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:09
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/30; B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10807; B32B17/10981; G01B7/02; G01B7/06; G01B7/08; G01B7/087; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/892; G01N21/896
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
83 words
A method of determining optical property of a transparent plastic sheet defined as a worked sheet exposed to heat or pressure from a transparent plastic sheet defined as an unworked sheet prior to exposure to the heat or pressure, comprising the steps of: scanning the unworked sheet to generate an optical profile of the unworked sheet; and altering portions of the optical profile of the unworked sheet to provide an altered optical profile which is the expected optical profile of the worked sheet.
Claim 2
Independent Claim
83 words
A method of determining optical property of a transparent plastic sheet defined as a worked sheet exposed to heat or pressure from a transparent plastic sheet defined as an unworked sheet prior to exposure to the heat or pressure, comprising the steps of: scanning the unworked sheet to generate an optical profile of the unworked sheet; and altering portions of the optical profile of the unworked sheet to provide an altered optical profile which is the expected optical profile of the worked sheet.
Claim 3
Dependent Claim
24 words
The method as set forth in claim 1 wherein said generating step includes the step of generating a thickness profile of the unworked sheet.
Claim 4
Dependent Claim
42 words
The method as set forth in claim 2 wherein said generating step includes the steps of: generating a thickness variation frequency signal; and said altering step includes the step of filtering frequencies above a predetermined value from the thickness variation frequency signal.
Claim 5
Dependent Claim
27 words
The method as set forth in claim 1 or 2 wherein said generating step include the step of generating a wedge angle profile of the unworked sheet.
Claim 6
Dependent Claim
42 words
The method as set forth in claim 4 wherein said generating step includes the steps of: generating a wedge angle frequency signal; and said altering step includes the step of filtering frequencies above a predetermined value from the wedge angle frequency signal.
Claim 7
Dependent Claim
25 words
The method as set forth in claim 1 wherein said generating step includes the step of generating an optical power profile of the unworked sheet.
Claim 8
Dependent Claim
42 words
The method as set forth in claim 6 wherein said generating step includes the steps of: generating an optical power frequency signal; and said altering step includes the step of filtering frequencies above a predetermined value from the optical power frequency signal.
Claim 9
Dependent Claim
70 words
The method as set forth in claim 1 wherein said step of generating an optical profile includes the steps of: generating a thickness variation signal of the unworked sheet; differentiating the thickness variation signal to provide a wedge angle signal; differentiating the wedge angle signal to provide an optical power signal; and said altering step includes the step of filtering frequencies above a predetermined value from the optical power signal.
Claim 10
Dependent Claim
86 words
An electrical system for determining optical property of a transparent plastic sheet defined as a worked sheet exposed to heat or pressure from a transparent plastic sheet defined as an unworked sheet prior to exposure to the heat or pressure, comprising: means for scanning the unworked sheet to generate optical profile of the unworked sheet; and means operatively connected to said scanning means for altering portions of the optical profile to provide an altered optical profile which is the expected optical profile of the worked sheet.
Claim 11
Dependent Claim
86 words
An electrical system for determining optical property of a transparent plastic sheet defined as a worked sheet exposed to heat or pressure from a transparent plastic sheet defined as an unworked sheet prior to exposure to the heat or pressure, comprising: means for scanning the unworked sheet to generate optical profile of the unworked sheet; and means operatively connected to said scanning means for altering portions of the optical profile to provide an altered optical profile which is the expected optical profile of the worked sheet.
Claim 12
Dependent Claim
36 words
The system as set forth in claim 9 wherein said scanning means includes: means for generating a thickness variation signal of the unworked sheet; and said altering means includes means for attenuating the thickness variation signal.
Claim 13
Dependent Claim
36 words
The system as set forth in claim 9 wherein said scanning means includes: means for generating a wedge angle signal of the unworked sheet; and said altering means includes means for attenuating the wedge angle signal.
Claim 14
Dependent Claim
36 words
The system as set forth in claim 9 wherein said scanning means includes: means for generating an optical power signal of the unworked sheet; and said altering means includes means for attenuating the optical power signal.
Claim 15
Dependent Claim
20 words
The system as set forth in claim 9 wherein the sheet is a plastic material used in manufacture of laminates.
Claim 16
Dependent Claim
54 words
The system as set forth in claim 13 wherein said scanning means includes: means for generating a thickness variation signal; a wedge angle signal; and an optical power signal of the unworked sheet; and said altering means includes means for attenuating the thickness variation signal; the wedge angle signal; or the optical power signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |