Patent US3655274A successfully refreshed from Google Patents.
US3655274A
Expired / Lapsed
US
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Gravity operated liquid prism
Assignee: Ingenuics Inc
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Filing: 1970-05-07
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Granted: 1972-04-11
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Expires: 1990-05-07
Abstract
Abstract A gravity operated liquid prism attached to an optical system intended for vertical orientation either up or down. The liquid prism includes a floating boat which moves with the liquid to remain horizontal when the other surface follows the mechanical motion in any direction of its support thus forming an optical wedge which deviates the optical axis of the system.
Inventors
- 👤 Dwin R Craig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:38
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/64; G02B27/646; G02B27/648; G02B5/00; G02B5/04; G02B5/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
169 words
A gravity operated liquid prism comprising a cylindrical container, a pair of chambers formed in said container by three spaced apart optically flat glass plates sealed to said container, a fluid partially filling each of said chambers with said fluid having an index of refraction of substantially 1.500, a glass bottom circular boat floating on the fluid in each of said chambers for forming a variable optical wedge with said fluid and the underlying glass plate, and an upstanding side wall on each of said boats having an outer surface corresponding to a section of a surface of a sphere having a radius slightly less than the inside radius of said cylindrical container, the space between said outer surface of saiD side wall and the inner surface of said cylinder being sufficiently small to produce capillary action to at least partially fill said space with said fluid, said fluid serving as a lubricant between said boat and said cylinder to insure free movement of said boat in said cylinder.
Claim 2
Dependent Claim
169 words
A gravity operated liquid prism comprising a cylindrical container, a pair of chambers formed in said container by three spaced apart optically flat glass plates sealed to said container, a fluid partially filling each of said chambers with said fluid having an index of refraction of substantially 1.500, a glass bottom circular boat floating on the fluid in each of said chambers for forming a variable optical wedge with said fluid and the underlying glass plate, and an upstanding side wall on each of said boats having an outer surface corresponding to a section of a surface of a sphere having a radius slightly less than the inside radius of said cylindrical container, the space between said outer surface of saiD side wall and the inner surface of said cylinder being sufficiently small to produce capillary action to at least partially fill said space with said fluid, said fluid serving as a lubricant between said boat and said cylinder to insure free movement of said boat in said cylinder.
Claim 3
Dependent Claim
13 words
A device as claimed in claim 1 wherein said cylindrical container is opaque.
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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |