US3131874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminaire
Assignee: Corning Glass Works
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Filing: 1962-02-27
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Granted: 1964-05-05
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Expires: 1982-02-27
Abstract
No abstract record available.
Inventors
- 👤 Kenneth E Fairbanks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:48
CPC Classifications
F; F21; F21V; F21V5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
236 words
A REFRACTOR IN THE GENERAL SHAPE OF A HOLLOW TRUNCATED TRIANGULAR PYRAMID HAVING AN OPEN BASE FORMING A RIM, AND COMPRISING AN END AREA ON ONE GENERALLY QUADRANGULAR FACE THEREOF, TWO SYMMETRIC SIDE AREAS ON THE REMAINING GENERALLY QUADRANGULAR FACES THEREOF, AND A BASE AREA ON THE GENERALLY TRIANGULAR FACE THEREOF, EACH OF SAID SIDE AREAS COMPRISING TWO SETS OF SURFACE PRISMS, THE PRISMS OF ONE OF SAID SETS HAVING EDGES SUBSTANTIALLY PARALLEL TO SAID RIM AND HAVING BASES NEAREST A LINE ON THEIR RESPECTIVE SIDE AREA SUBSTANTIALLY PARALLEL TO SAID RIM AND THE OTHER OF SAID SETS HAVING EDGES SUBSTANTIALLY PERPENDICULAR TO SAID RIM AND HAVING BASE EDGES NEAREST A LINE ON THEIR RESPECTIVE SIDE AREA SUBSTANTIALLY PERPENDICULAR TO SAID RIM, SAID END AREA HAVING A REFLECTING SURFACE, AND SAID BASE AREA COMPRISING FOUR SETS OF SURFACE PRISMS, THE FIRST SET COMPRISING A SERIES OF PRISMS HAVING EDGES SUBSTANTIALLY PARALLEL TO SAID END AREA OF SAID REFRACTOR AND HAVING BASES AT THEIR EDGES FARTHEST FROM SAID END AREA, THE SECOND SET COMPRISING A SERIES OF PARALLEL PRISMS HAVING EDGES SUBSTANTIALLY PERPENDICULAR TO SAID END AREA AND HAVING SURFACES WHICH ARE CURVED IN CROSS SECTION, AND EACH OF SAID THIRD AND FOURTH SETS COMPRISING A SERIES OF PARALLEL PRISMS, THE PRISMS OF SAID THIRD AND FOURTH SETS HAVING EDGES SUBSTANTIALLY PERPENDICULAR AND FORMING ANGLES OF APPROXIMATELY 45* WITH THE PRISMS OF SAID FIRST AND SECOND SETS.
Claim 2
Dependent Claim
236 words
A REFRACTOR IN THE GENERAL SHAPE OF A HOLLOW TRUNCATED TRIANGULAR PYRAMID HAVING AN OPEN BASE FORMING A RIM, AND COMPRISING AN END AREA ON ONE GENERALLY QUADRANGULAR FACE THEREOF, TWO SYMMETRIC SIDE AREAS ON THE REMAINING GENERALLY QUADRANGULAR FACES THEREOF, AND A BASE AREA ON THE GENERALLY TRIANGULAR FACE THEREOF, EACH OF SAID SIDE AREAS COMPRISING TWO SETS OF SURFACE PRISMS, THE PRISMS OF ONE OF SAID SETS HAVING EDGES SUBSTANTIALLY PARALLEL TO SAID RIM AND HAVING BASES NEAREST A LINE ON THEIR RESPECTIVE SIDE AREA SUBSTANTIALLY PARALLEL TO SAID RIM AND THE OTHER OF SAID SETS HAVING EDGES SUBSTANTIALLY PERPENDICULAR TO SAID RIM AND HAVING BASE EDGES NEAREST A LINE ON THEIR RESPECTIVE SIDE AREA SUBSTANTIALLY PERPENDICULAR TO SAID RIM, SAID END AREA HAVING A REFLECTING SURFACE, AND SAID BASE AREA COMPRISING FOUR SETS OF SURFACE PRISMS, THE FIRST SET COMPRISING A SERIES OF PRISMS HAVING EDGES SUBSTANTIALLY PARALLEL TO SAID END AREA OF SAID REFRACTOR AND HAVING BASES AT THEIR EDGES FARTHEST FROM SAID END AREA, THE SECOND SET COMPRISING A SERIES OF PARALLEL PRISMS HAVING EDGES SUBSTANTIALLY PERPENDICULAR TO SAID END AREA AND HAVING SURFACES WHICH ARE CURVED IN CROSS SECTION, AND EACH OF SAID THIRD AND FOURTH SETS COMPRISING A SERIES OF PARALLEL PRISMS, THE PRISMS OF SAID THIRD AND FOURTH SETS HAVING EDGES SUBSTANTIALLY PERPENDICULAR AND FORMING ANGLES OF APPROXIMATELY 45* WITH THE PRISMS OF SAID FIRST AND SECOND SETS.
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) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |