Patent US4779942A successfully refreshed from Google Patents.
US4779942A
Expired / Lapsed
US
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NVG compatible red light
Assignee: RTX Corp
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Filing: 1985-12-09
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Granted: 1988-10-25
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Expires: 2005-12-09
Abstract
Abstract Night Vision Goggle compatible red lighting in which the red light does not adversely affect the gain of the night vision goggles yet is visible to the unaided eye. The red light is filtered by a filter which transmits at least about 80% of the visible spectrum within a range up to about 640 nanometers in wavelength and inhibits the transmission of 99.9% of said red light above about 720 nanometers in wavelength on the electromagnetic spectrum within the spectral sensitivity of the night vision goggles.
Inventors
- 👤 Jay F. Verney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:06
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/12; G02B23/125; G02B5/00; G02B5/20; G02B5/208
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
125 words
A method of altering the emission of a light source in an aircraft cockpit, said cockpit having a night vision imaging system which includes a binocular night vision goggle apparatus suitably oriented to permit viewing both under and through said goggle apparatus, said system providing image intensification of light energy in the red and IR regions of the electromagnetic spectrum, wherein said method includes the step of; filtering said light source to permit compatible viewing thereof while operating said night vision imaging system, wherein said light source is filtered such that at least about 80% of visible light energy is transmitted within a range up to about 640 nm and at least about 99.9% of light energy is inhibited from transmission above about 720 nm.
Claim 2
Independent Claim
125 words
A method of altering the emission of a light source in an aircraft cockpit, said cockpit having a night vision imaging system which includes a binocular night vision goggle apparatus suitably oriented to permit viewing both under and through said goggle apparatus, said system providing image intensification of light energy in the red and IR regions of the electromagnetic spectrum, wherein said method includes the step of; filtering said light source to permit compatible viewing thereof while operating said night vision imaging system, wherein said light source is filtered such that at least about 80% of visible light energy is transmitted within a range up to about 640 nm and at least about 99.9% of light energy is inhibited from transmission above about 720 nm.
Claim 3
Dependent Claim
41 words
The method for altering the emission of said light source as described in claim 1 further including the step of reducing the magnitude of said light source to between 5 to 0.1 footlamberts during operation of said night vision imaging system.
Claim 4
Dependent Claim
31 words
The method for altering the emission of said light source as described in claim 1 further including the step of increasing the magnitude of said light energy to about 150 footlamberts.
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) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |