Patent AT185976B successfully refreshed from Google Patents.
US3137784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for protecting the eyes of welders
Assignee: Individual
•
Filing: 1962-02-19
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Granted: 1964-06-16
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Expires: 1982-02-19
Abstract
No abstract record available.
Inventors
- 👤 Kasemann Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:08
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/04; A61F9/06; A61F9/061; A61F9/062
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A DEVICE FOR PROTECTING THE EYES OF WELDERS AGAINST RAYS CONSISTING OF A PAIR OF POLARIZATION FILTERS POSITIONED SO THAT THEIR DIRECTIONS OF VIBRATION CROSS EACH OTHER, AN OPTICAL BIREFRINGENT DISC PRODUCING A PHASE DIFFERENCE OF ABOUT HALF A WAVE LENGTH OF LIGHT AT THE MIDDLE OF THE VISIBLE SPECTRUM, THE DISC BEING POSITIONED BETWEEN THE POLARIZATION FILTERS THE PAIR, AND MEANS FOR ROTATING THE DISC ABOUT ITS CENTER A PREDETERMINED AMOUNT FOR VARYING THE TOTAL ABSORPTION OF THE CROSSED POLARIZATION FILTERS IN ACCORDANCE WITH THE ROTATED POSITION OF THE DISC AXIS.
Claim 2
Independent Claim
92 words
A DEVICE FOR PROTECTING THE EYES OF WELDERS AGAINST RAYS CONSISTING OF A PAIR OF POLARIZATION FILTERS POSITIONED SO THAT THEIR DIRECTIONS OF VIBRATION CROSS EACH OTHER, AN OPTICAL BIREFRINGENT DISC PRODUCING A PHASE DIFFERENCE OF ABOUT HALF A WAVE LENGTH OF LIGHT AT THE MIDDLE OF THE VISIBLE SPECTRUM, THE DISC BEING POSITIONED BETWEEN THE POLARIZATION FILTERS THE PAIR, AND MEANS FOR ROTATING THE DISC ABOUT ITS CENTER A PREDETERMINED AMOUNT FOR VARYING THE TOTAL ABSORPTION OF THE CROSSED POLARIZATION FILTERS IN ACCORDANCE WITH THE ROTATED POSITION OF THE DISC AXIS.
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) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |