US5719715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater color correction
Assignee: Individual
•
Filing: 1993-12-16
•
Granted: 1998-02-17
•
Expires: 2013-12-16
Abstract
Abstract A filter for underwater color correction is described which could be characterized by optical transmission exhibiting more attenuation of blue/green light than red light and having a ratio of transmission at 600 nanometers and 700 nanometers substantially less than 50%.
Inventors
- 👤 Lawrence A. Westhaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:01
CPC Classifications
B; B63; B63C; B63C11/00; B63C11/02; B63C11/12; B63C11/48; G; G02; G02B; G02B23/00; G02B23/16; G02B23/22; G02B5/00; G02B5/20; G02B5/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
31 words
A color correcting filter for use underwater comprising a material with optical transmission properties as shown in any of FIGS. 2, 4, 5, 6, 7, 8, 9, 10, 11 and 12.
Claim 2
Dependent Claim
31 words
A color correcting filter for use underwater comprising a material with optical transmission properties as shown in any of FIGS. 2, 4, 5, 6, 7, 8, 9, 10, 11 and 12.
Claim 3
Dependent Claim
57 words
A color correcting filter for use underwater with optical path lengths in excess of about 10 feet comprising material with optical transmission properties exhibiting more attenuation throughout a range of 400 to 420 nanometers than in the range of about 680 nanometers, with a ratio of transmission at 600 nanometers and 700 nanometers substantially less than 50%.
Claim 4
Dependent Claim
57 words
A color correcting filter for use underwater with optical path lengths in excess of about 10 feet comprising material with optical transmission properties exhibiting more attenuation throughout a range of 400 to 420 nanometers than in the range of about 680 nanometers, with a ratio of transmission at 600 nanometers and 700 nanometers substantially less than 50%.
Claim 5
Dependent Claim
53 words
A color correcting filter for use underwater comprising: a) an entrance subject to impinging light; b) an exit from which light is emitted; and c) located between said entrance and exit, a material with optical properties as shown in any of FIGS. 2, 4, 5, 6, 7, 8, 9, 10, 11 and 12.
Claim 6
Dependent Claim
53 words
A color correcting filter for use underwater comprising: a) an entrance subject to impinging light; b) an exit from which light is emitted; and c) located between said entrance and exit, a material with optical properties as shown in any of FIGS. 2, 4, 5, 6, 7, 8, 9, 10, 11 and 12.
Claim 7
Dependent Claim
78 words
A color correcting filter for use underwater with optical path lengths in excess of about 10 feet comprising an entrance subject to impinging light, an exit from which light is emitted, and located between said entrance and exit, a material with optical transmission properties exhibiting more attenuation throughout a range of 400 to 420 nanometers than in the range of about 680 nanometers, with a ratio of transmission at 600 nanometers and 700 nanometers substantially less than 50%.
Claim 8
Dependent Claim
78 words
A color correcting filter for use underwater with optical path lengths in excess of about 10 feet comprising an entrance subject to impinging light, an exit from which light is emitted, and located between said entrance and exit, a material with optical transmission properties exhibiting more attenuation throughout a range of 400 to 420 nanometers than in the range of about 680 nanometers, with a ratio of transmission at 600 nanometers and 700 nanometers substantially less than 50%.
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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) | 2001-02-16 | 2001-08-18 | 2002-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-02-16 | 2005-08-18 | 2006-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-02-16 | 2009-08-18 | 2010-02-17 | $7700.00 | Window Closed / Lapsed |