Patent US3251987A successfully refreshed from Google Patents.
US3251987A
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Refractor
Assignee: Holophane Corp
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Filing: 1963-11-08
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Granted: 1966-05-17
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Expires: 1983-11-08
Abstract
No abstract record available.
Inventors
- 👤 Vearl S Wince
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:14
CPC Classifications
F; F21; F21V; F21V17/00; F21V17/10; F21V17/18; F21V5/00; F21V5/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A REFRACTOR FOR USE WITH A LINE SOURCE OF LIGHT MOUNTED ON A CEILING OF A CORRIDOR OR THE LIKE, COMPRISING A PLURALITY OF TRANSVERSE CUT-OFF PRISM MEANS FOR INTERNALLY REFLECTING HIGH ANGLED LIGHT WHICH WOULD OTHERWISE BE EMITTED AT GLARE ANGLES IN THE DIRECTION OF SAID CORRIDOR, SAID PRISM MEANS BEING FORMED OF SURFACES DEFINING PEAKS AND VALLEYS, A PLURALITY OF REFRACTING PRISMS EXTENDING LONGITUDINALLY THROUGH SAID TRANSVERSE PRISMS, SOME OF SAID REFRACTING PRIMS COMPRISING SHALLOW PRISMS LYING IN PLANES AT A PREDETERMINED DEPTH AND INWARDLY OF THE PEAKS OF SAID PRISMS MEANS, SAID CUT-OFF PRISM MEANS FURTHER COMPRISING MEANS FOR SHIELDING LIGHT EMITTED BY SAID SHALLOW PRISMS APPROACHING THE HORIZONTAL IN THE DIRECTION OF SAID CORRIDOR.
Claim 2
Dependent Claim
118 words
A REFRACTOR FOR USE WITH A LINE SOURCE OF LIGHT MOUNTED ON A CEILING OF A CORRIDOR OR THE LIKE, COMPRISING A PLURALITY OF TRANSVERSE CUT-OFF PRISM MEANS FOR INTERNALLY REFLECTING HIGH ANGLED LIGHT WHICH WOULD OTHERWISE BE EMITTED AT GLARE ANGLES IN THE DIRECTION OF SAID CORRIDOR, SAID PRISM MEANS BEING FORMED OF SURFACES DEFINING PEAKS AND VALLEYS, A PLURALITY OF REFRACTING PRISMS EXTENDING LONGITUDINALLY THROUGH SAID TRANSVERSE PRISMS, SOME OF SAID REFRACTING PRIMS COMPRISING SHALLOW PRISMS LYING IN PLANES AT A PREDETERMINED DEPTH AND INWARDLY OF THE PEAKS OF SAID PRISMS MEANS, SAID CUT-OFF PRISM MEANS FURTHER COMPRISING MEANS FOR SHIELDING LIGHT EMITTED BY SAID SHALLOW PRISMS APPROACHING THE HORIZONTAL IN THE DIRECTION OF SAID CORRIDOR.
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) | 1969-05-16 | 1969-11-15 | 1970-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-16 | 1973-11-15 | 1974-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-16 | 1977-11-15 | 1978-05-17 | $7700.00 | Window Closed / Lapsed |