US3893754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination paraboloid-ellipsoid mirror system
Assignee: Xerox Corp
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Filing: 1973-06-21
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Granted: 1975-07-08
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Expires: 1993-06-21
Abstract
Abstract A mirror system for imaging an object by reflection, in which the reflecting surfaces intermediate the object and image are partially paraboloidal and partially ellipsoidal.
Inventors
- 👤 John A Mcinally
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:36
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/02; G02B17/06; G02B17/0647; G02B17/0663; G02B30/00; G02B30/50; G02B30/56; G02B5/00; G02B5/08; G02B5/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
119 words
A combination ellipsoidal-paraboloidal mirror including: an ellipsoidal reflector surface dispoSed about a pair of ellipsoidal focal points defining the principal axis of said mirror, a first paraboloidal reflector surface having a first paraboloidal focal point, a second paraboloidal reflector surface facing said first paraboloidal reflector surface and coaxial therewith and having a second paraboloidal focal point, said first and second paraboloidal focal points each corresponding to one of said pair of ellipsoidal focal points, the paraboloidal and ellipsoidal geometries of said reflector surfaces being coplanar in all planes which include both of said focal points, said reflector surfaces arranged so that said ellipsoidal reflector surface and said paraboloidal reflector surface together comprise the inner reflecting surface of said mirror.
Claim 2
Dependent Claim
119 words
A combination ellipsoidal-paraboloidal mirror including: an ellipsoidal reflector surface dispoSed about a pair of ellipsoidal focal points defining the principal axis of said mirror, a first paraboloidal reflector surface having a first paraboloidal focal point, a second paraboloidal reflector surface facing said first paraboloidal reflector surface and coaxial therewith and having a second paraboloidal focal point, said first and second paraboloidal focal points each corresponding to one of said pair of ellipsoidal focal points, the paraboloidal and ellipsoidal geometries of said reflector surfaces being coplanar in all planes which include both of said focal points, said reflector surfaces arranged so that said ellipsoidal reflector surface and said paraboloidal reflector surface together comprise the inner reflecting surface of said mirror.
Claim 3
Dependent Claim
94 words
A combination elliptical-parabolic mirror including: an elliptical reflector surface disposed about a pair of elliptical foci, a first parabolic reflector surface having a first parabolic focus, a second parabolic reflector surface facing said first parabolic reflector surface and having a second parabolic focus, said first and second parabolic foci each corresponding to one of said pair of elliptical foci, the parabolic and elliptical geometries of said reflector surfaces being coplanar, said reflector surfaces arranged so that said elliptical reflector surface and said parabolic reflector surfaces together comprise the inner reflecting surface of said mirror.
Claim 4
Dependent Claim
94 words
A combination elliptical-parabolic mirror including: an elliptical reflector surface disposed about a pair of elliptical foci, a first parabolic reflector surface having a first parabolic focus, a second parabolic reflector surface facing said first parabolic reflector surface and having a second parabolic focus, said first and second parabolic foci each corresponding to one of said pair of elliptical foci, the parabolic and elliptical geometries of said reflector surfaces being coplanar, said reflector surfaces arranged so that said elliptical reflector surface and said parabolic reflector surfaces together comprise the inner reflecting surface of said mirror.
Claim 5
Dependent Claim
27 words
The reflector surface defined in claim 2 in which the defined geometry obtains in all planes parallel to said common plane, resulting in a cylindrical reflector surface.
References Cited (Backward Citations)
US3774995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |