US3567309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glareless light viewing devices
Assignee: Individual
•
Filing: 1969-09-17
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Granted: 1971-03-02
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Expires: 1989-09-17
Abstract
Abstract A VIEWING DEVICE FOR EXAMINING OBJECTS INCORPORATING A LIGHT SOURCE AND A FIRST POLARIZING MEANS POSITIONED IN FRONT OF THE LIGHT SOURCE TO IRRADIATE THE OBJECT. REFLECTED LIGHT FROM THE OBJECT IN TURN PASSES BACK THROUGH A SECOND POLARIZING MEANS POSITIONED IN LINE WITH A VIEWING OPENING AND EFFECTING POLARIZATION IN A DIRECTION DIFFERENT FROM THE FIRST POLARIZING MEANS. THE DIFFERENCE IN POLARIZATION IS 90*, CONTROLLING GLARE AND HIGHLIGHTING THE OBJECT BEING EXAMINED.
Inventors
- 👤 Joseph Jasgur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:31
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/28; G02B27/281
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |