Patent US5246420A successfully refreshed from Google Patents.
US3556657A
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Laser rangefinder
Assignee: FRED W QUELLE JR
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Filing: 1968-01-26
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Granted: 1971-01-19
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Expires: 1988-01-26
Abstract
Abstract THE COMBINATION OF AN ERBIUM Q-SPOILED LASER AND A GERMANIUM AVALANCHE DIODE DETECTOR, BOTH OPERATING IN THE 1.5 MICRON REGION, PROVIDES A LASER RANGEFINDER OR TARGET DESIGNATION SYSTEM HAVING EXCELLENT TRANSMISSION CHARACTERISTICS THROUGH ADVERSE ATMOSPHERIC CONDITIONS WHILE PRESENTING NO HAZARD TO THE HUMAN EYE. THE GERMANIUM AVALANCHE DIODE AND THE MULTIPLY DOPED, ERBIUM GLASS LASER COMBINATION, IN ADDITION TO ELIMINATING THE EYE HAZARD PROBLEM, ALSO PROVIDES AS MUCH AS AN ORDER OF MAGNITUDE IMPROVEMENT IN EFFICIENCY OVER RUBY-LASER, PHOTOMULTIPLIER-DETECTOR SYSTEMS.
Inventors
- 👤 Fred W Quelle Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:04
CPC Classifications
G; G01; G01S; G01S17/00; G01S17/02; G01S17/06; G01S17/08; G01S17/10; G01S17/14; A; A44; A44C; A44C9/00; A44C9/02
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |