Patent US3588245A successfully refreshed from Google Patents.
US3588245A
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US
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Adjustable compensation in optical systems
Assignee: AT&T Inc
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Filing: 1968-10-01
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Granted: 1971-06-28
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Expires: 1988-10-01
Abstract
Abstract A PLURALITY OF LENSES ARE ARRANGED ALONG AN OPTIC AXIS THROUGH WHICH LIGHT OF A SUBSTANTIALLY SINGLE FREQUENCY IS DIRECTED. A SPHERICAL INTERFERENCE FILTER IS LOCATED SYMMETRICALLY ON THE OPTICAL AXIS AND IS CAPABLE OF BEING MOVED AXIALLY OR TILTED IN ORDER TO GIVE NONUNIFOM LIGHT TRANSMISSION TO COMPENSATE FOR A LIGHT INTENSITY GRADIENT CREATED BY THE PLURALITY OF LENSES. OTHER FILTER CONFIGURATIONS ARE ALSO DESCRIBED.
Inventors
- 👤 Donald R Herriott
- 👤 Eric G Rawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:08
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/28; G02B5/285; G02B5/286; G03; G03B; G03B15/00; H; H10; H10P; H10P95/00
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |