US3614211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically actuated shutter
Assignee: Bausch and Lomb Inc
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Filing: 1964-01-03
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Granted: 1971-10-19
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Expires: 1984-01-03
Abstract
Abstract 1. A shutter comprising a pair of prisms, a surface of one of said prisms disposed in a light path at an angle greater than the critical angle of internal reflection with respect to an incident light ray, means defining a fluid reservoir between said prisms, a fluid disposed in said reservoir having an index of refraction approximately equal to the index of refraction of said prisms, said fluid contacting said surface when the shutter is in a first operative position, and means ejecting said fluid from said reservoir to thereby change the reflective characteristics of said shutter.
Inventors
- 👤 Eugene C Letter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:57
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G02; G02B; G02B26/00; G02B26/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A shutter comprising a pair of prisms, a surface of one of said prisms disposed in a light path at an angle greater than the critical angle of internal reflection with respect to an incident light ray, means defining a fluid reservoir between said prisms, a fluid disposed in said reservoir having an index of refraction approximately equal to the index of refraction of said prisms, said fluid contacting said surface when the shutter is in a first operative position, and means ejecting said fluid from said reservoir to thereby change the reflective characteristics of said shutter.
Claim 2
Dependent Claim
97 words
A shutter comprising a pair of prisms, a surface of one of said prisms disposed in a light path at an angle greater than the critical angle of internal reflection with respect to an incident light ray, means defining a fluid reservoir between said prisms, a fluid disposed in said reservoir having an index of refraction approximately equal to the index of refraction of said prisms, said fluid contacting said surface when the shutter is in a first operative position, and means ejecting said fluid from said reservoir to thereby change the reflective characteristics of said shutter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |