US3671108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensating device and lens system including same
Assignee: Individual
•
Filing: 1970-07-10
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Granted: 1972-06-20
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Expires: 1990-07-10
Abstract
Abstract A LENS SYSTEM INCLUDES AN ANNULAR TEMPERATURE COMPENSATING RING DISPOSED BETWEEN LENS COMPONENTS, THE RING HAVING A THERMAL COEFFICIENT OF EXPANSION WHICH IS SUFFICIENTLY HIGH TO COMPENSATE FOR CHANGES IN THE FOCAL LENGTH OF THE LENS SYSTEM RESULTING FROM TEMPERATUREINDUCED CHANGES IN THE REFRACTIVE INDEX OF THE LENS ELEMENTS. IN A PREFERRED EMBODIMENT, THE TEMPERATURE COMPENSATING DEVICE COMPRISES A PLURALITY OF V-SHAPED PROJECTIONS EXTENDING AXIALLY FROM ONE SIDE OF THE ANNULAR RING, THE SHAPE OF THE PROJECTIONS AND OF THE NOTCHES DEFINED THEREBY BEING SUCH THAT THE AXIAL LENGTH OF THE PROJECTIONS WITH TEMPERATURE-INDUCED CHANGES IN THE SIZE OF THE RING.
Inventors
- 👤 Alfred Kilgus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:24
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/008; G02B7/02; G02B7/028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |