US4893902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual-pane thermal window with liquid crystal shade
Assignee: Honeywell International Inc
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Filing: 1989-05-12
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Granted: 1990-01-16
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Expires: 2009-05-12
Abstract
Abstract A dual-pane thermal window unit comprises two non-intersecting or, preferably, substantially parallel, spaced window panes, mounted in a window frame, a first of the panes having affixed thereto a first wall of an electro-optical liquid crystal cell providing a selected light transmittance, and a second of said panes delimiting, with a second wall of said cell, a space providing a thermal break. Each of the first and second walls comprises an electrically conductive film composed of plastic and having sufficient supporting strength to maintain the structural integrity of the cell. The window is light weight, economical to manufacture and efficient and reliable in operation.
Inventors
- 👤 Ray H. Baughman
- 👤 Ernest D. Buff
- 👤 Helmut Eckhardt
- 👤 Gerhard H. Fuchs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:00
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133308; E; E06; E06B; E06B3/00; E06B3/66; E06B3/67; E06B3/6715; E06B3/6722; G02F1/1347; E06B9/00; E06B9/24; E06B2009/2464
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
97 words
A method for decreasing radiative and conductive heat transfer between the exterior and the interior of a building, comprising the steps of: (a) mounting within a window frame a plurality of spaced window panes; (b) affixing to said panes a plurality of liquid crystal cells, each of said cells being affixed to a different one of said panes; and (c) delimiting within said window frame a plurality of spaces providing a plurality of thermal breaks, each of said spaces being delimited between a wall of each of said cells and a face of each of said panes.
Claim 2
Independent Claim
97 words
A method for decreasing radiative and conductive heat transfer between the exterior and the interior of a building, comprising the steps of: (a) mounting within a window frame a plurality of spaced window panes; (b) affixing to said panes a plurality of liquid crystal cells, each of said cells being affixed to a different one of said panes; and (c) delimiting within said window frame a plurality of spaces providing a plurality of thermal breaks, each of said spaces being delimited between a wall of each of said cells and a face of each of said panes.
Claim 3
Dependent Claim
82 words
A thermal-pane window unit resistant to radiative heat transfer as well as conductive heat transfer, comprising: (a) a plurality of substantially parallel, spaced window panes, mounted in a window frame; (b) a plurality of liquid crystal cells, each of said cells being affixed to a different one of said panes; and (c) a plurality of thermal breaks, each of said thermal breaks being a space delimited between a wall of each of said cells and a face of each of said panes.
Claim 4
Dependent Claim
82 words
A thermal-pane window unit resistant to radiative heat transfer as well as conductive heat transfer, comprising: (a) a plurality of substantially parallel, spaced window panes, mounted in a window frame; (b) a plurality of liquid crystal cells, each of said cells being affixed to a different one of said panes; and (c) a plurality of thermal breaks, each of said thermal breaks being a space delimited between a wall of each of said cells and a face of each of said panes.
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) | 1993-01-15 | 1993-07-17 | 1994-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-15 | 1997-07-17 | 1998-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-15 | 2001-07-17 | 2002-01-16 | $7700.00 | Window Closed / Lapsed |