Patent US878022A successfully refreshed from Google Patents.
US5221998A
Expired / Lapsed
US
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Joined prism assembly and method and apparatus for manufacturing same
Assignee: Pentax Corp
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Filing: 1992-04-01
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Granted: 1993-06-22
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Expires: 2012-04-01
Abstract
Abstract A joined prism assembly having more than two prisms adhered to each other at joining surfaces is disclosed. The joined prism includes stepped portions between the end faces of the prisms adjacent to the joining surfaces for defining exposed positioning reference surfaces for when the prisms are adhered to each other.
Inventors
- 👤 Bunkichi Sugahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:35
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/10; G02B27/1006; G02B27/102; G02B27/1073; G02B27/14; G02B27/149; G02B5/00; G02B5/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
47 words
A joined prism assembly having more than two prisms adhered to each other at joining surfaces, wherein a stepped portion between end faces of said prisms adjacent to said joining surfaces for defining exposed positioning reference surfaces is formed when said prisms are adhered to each other.
Claim 2
Dependent Claim
47 words
A joined prism assembly having more than two prisms adhered to each other at joining surfaces, wherein a stepped portion between end faces of said prisms adjacent to said joining surfaces for defining exposed positioning reference surfaces is formed when said prisms are adhered to each other.
Claim 3
Dependent Claim
14 words
The joined prism assembly according to claim 1, wherein said prisms have different thicknesses.
Claim 4
Dependent Claim
34 words
The joined prism assembly according to claim 1, wherein said prisms have a same thickness and wherein said joining surfaces of the prisms to be adhered are deviated in the direction of the thickness.
Claim 5
Dependent Claim
22 words
The joined prism assembly according to claim 1, wherein said prism assembly comprises four prisms having an isosceles right triangle cross-sectional shape.
Claim 6
Dependent Claim
50 words
The joined prism assembly according to claim 1, wherein said joined prism assembly comprises four right-angle prisms having an isosceles right triangle in cross-section, and adhered to each other at their adjacent sides defining the right-angle apexes, so that the joined prism assembly has the shape of a rectangular parallelepiped.
Claim 7
Dependent Claim
41 words
The joined prism assembly according t claim 5, wherein said four right-angle prisms comprises two identical wide prisms having a larger width and two identical narrow prisms having a small width, said wide prisms and said narrow prisms being alternately arranged.
Claim 8
Dependent Claim
43 words
The joined prism assembly according to claim 5, wherein said four right-angle prisms comprises two identical wide prisms having a larger width and two identical narrow prisms having a small width, said wide prisms and said narrow prisms being arranged side by side.
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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) | 1996-06-21 | 1996-12-21 | 1997-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-21 | 2000-12-21 | 2001-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-21 | 2004-12-21 | 2005-06-22 | $7700.00 | Window Closed / Lapsed |