Patent US5227820A successfully refreshed from Google Patents.
US5227820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shading device of the LCD projecting plate
Assignee: CTX Opto Electronics Corp
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Filing: 1992-06-01
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Granted: 1993-07-13
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Expires: 2012-06-01
Abstract
Abstract A shading device of LCD projecting plate has a pair of shading board being capable of being adjusted to shade the rest projecting areas which are uncovered by the plate and to project the drawing or letters on the optical glass to a wall or a screen clearly whenever used with any projectors.
Inventors
- 👤 Kazuhiro Miyashita
- 👤 Chia-Chen Liao
- 👤 Chien-Chung Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:55
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/132; Y; Y10; Y10S; Y10S353/00; Y10S353/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A shading device for an LCD projection plate member located on a projection plane of a projector comprising: (a) a projection plate member having a pair of guide recesses formed within a bottom section of said projection plate member, said guide recesses extending in a longitudinal direction and being transversely displaced each from the other on opposing transverse ends of said projection plate member; (b) a pair of shading board members slidably insertable within said guide recesses, each of said shading board members having a pair of longitudinally directed and transversely displaced through openings for insert therethrough of respective threaded members for securement to said bottom section of said projection plate member, whereby said shading board members may be longitudinally displaced to cover said projection plane external to said LCD projection plate member.
Claim 2
Dependent Claim
133 words
A shading device for an LCD projection plate member located on a projection plane of a projector comprising: (a) a projection plate member having a pair of guide recesses formed within a bottom section of said projection plate member, said guide recesses extending in a longitudinal direction and being transversely displaced each from the other on opposing transverse ends of said projection plate member; (b) a pair of shading board members slidably insertable within said guide recesses, each of said shading board members having a pair of longitudinally directed and transversely displaced through openings for insert therethrough of respective threaded members for securement to said bottom section of said projection plate member, whereby said shading board members may be longitudinally displaced to cover said projection plane external to said LCD projection plate member.
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) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |