Patent US5170501A successfully refreshed from Google Patents.
US5170501A
Expired / Lapsed
US
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Welding mask to prevent orange flare and method of welding
Assignee: Individual
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Filing: 1991-05-23
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Granted: 1992-12-15
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Expires: 2011-05-23
Abstract
Abstract An improved welding mask glass to prevent orange flare is provided by utilizing as the glass in the lens a narrow bandpass green glass sold under Model S-8008N from Schott Glass Technologies, Inc., of Duryea, Pennsylvania. The transmission characteristic of the glass is a sharp cutoff from a peak of 544 nanometers toward the infrared which rejects objectionable "orange flares."
Inventors
- 👤 R. Kent White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:22
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/04; A61F9/06; A61F9/065
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
In a welding mask or goggle having a filter glass lens for protection of human eyes, said eyes having a predetermined visual response frequency characteristic, in a welding environment where light flashes of high intensity may occur within said visual characteristic, said filter glass lens comprising: a one-piece filter glass shaped for use as a said lens having a narrow bandpass to reject substantially all the ultraviolet wavelengths below 465 nanometers and substantially all infrared wavelengths above 570 nanometers with a transmission peak centered at a substantially 544 nanometer wavelength and having a sharp cutoff toward the infrared of substantially 570 nanometers and having substantial transmittance above 525 nanometers to provide an area of transmittance to the human eye between 525 and 570 nanometers.
Claim 2
Dependent Claim
124 words
In a welding mask or goggle having a filter glass lens for protection of human eyes, said eyes having a predetermined visual response frequency characteristic, in a welding environment where light flashes of high intensity may occur within said visual characteristic, said filter glass lens comprising: a one-piece filter glass shaped for use as a said lens having a narrow bandpass to reject substantially all the ultraviolet wavelengths below 465 nanometers and substantially all infrared wavelengths above 570 nanometers with a transmission peak centered at a substantially 544 nanometer wavelength and having a sharp cutoff toward the infrared of substantially 570 nanometers and having substantial transmittance above 525 nanometers to provide an area of transmittance to the human eye between 525 and 570 nanometers.
Claim 3
Dependent Claim
24 words
In a welding mask or goggle as in claim 1 where said bandpass width at half of said peak is less than 28 nanometers.
Claim 4
Dependent Claim
16 words
In a welding mask or goggle as in claim 1 wherein said glass includes chromium dioxide.
Claim 5
Dependent Claim
30 words
In a welding mask or goggle as in claim 1 wherein said sharp cutoff filters the incandescence of sodium or potassium salts which may be present in the welding environment.
Claim 6
Dependent Claim
21 words
In a welding mask or goggle as in claim 1 wherein said glass has a peak transmittance of less than 15%.
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) | 1995-12-15 | 1996-06-15 | 1996-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-15 | 2000-06-15 | 2000-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-15 | 2004-06-15 | 2004-12-15 | $7700.00 | Window Closed / Lapsed |