US3729616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically heated window
Assignee: General Electric Co
•
Filing: 1971-07-26
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Granted: 1973-04-24
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Expires: 1991-07-26
Abstract
Abstract A laminated safety glass window is described having a clear polymer inner layer which includes a pattern of wrinkled resistance wires oriented in non-parallel random fashion so as to reduce glare from the wires when the window is used as a windshield. The individual resistance wires are partially embedded in the polymer sheet by a technique utilizing shrinkage of a thermoplastic polymer from its original dimensions when heated to an elevated temperature together with having the individual wires change configuration when relaxed from tension forces on the wire when first assembled with the polymer sheet. A method of forming the wire-incorporated polymer sheet member is also described along with equipment for automatically applying prestressed resistance wire to a thermoplastic sheet followed by heating the assembly under proper conditions to form the composite member.
Inventors
- 👤 G Gruss
- 👤 L Pfeiler
- 👤 G Polanka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:59
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10807; B32B17/10816; B32B17/10871; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/16; B29C70/28; B29C70/54; B29C70/56; B29C70/68; B29C70/82; B29D; B29D23/00; B29D23/001; B29D23/003; B29D23/005; B32B17/10165; B32B17/10376; B32B17/10385; B32B17/1055; B32B17/10761; H; H05; H05B; H05B3/00; H05B3/84; H05B3/86; B29K; B29K2995/00; B29K2995/0003; B29K2995/0005; H05B2203/00; H05B2203/017
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
52 words
A composite sheet member as in claim 1 wherein the layer of thermoplastic polymer undergoes greater shrinkage in a given direction along the major surface compared with a direction along said major surface substantially perpendicular thereto with the path of said resistance wires corresponding to the greater shrinkage direction of the polymer.
Claim 2
Dependent Claim
142 words
A composite sheet member which comprises a layer of transparent thermoplastic polymer which has been heat-shrunk from its original dimensions by heating to an elevated temperature having partially embedded in one major surface and extending above said major surface at different elevations where not embedded a plurality of wrinkled resistance wires each connected at opposite ends with common bus-bar electrode means, said individual resistance wires lying in closely spaced relationship and being oriented with respect to one another in non-parallel random fashion governed by thermal expansion differences between the polymer and said resistance wires as well as residual stress in the individual wires with said random orientation of resistance wires appearing both in the plane of said major surface of the polymer layer as well as in a plane at some angle thereto so as to reduce light reflection from the wire.
Claim 3
Dependent Claim
108 words
A laminated safety glass member which comprises a pair of glass outer layers having a composite inner layer integrally bonded thereto, said composite inner layer comprising a sheet of transparent thermoplastic polymer which has been heat-shrunk from its original dimensions by heating to an elevated temperature having partially embedded in one major surface a plurality of wrinkled resistance wires which lie in closely spaced relationship and are oriented with respect to one another in non-parallel random fashion so that portions of said individual resistance wires protrude from said major surface of the thermoplastic polymer layer, and bus-bar electrode means connected at each end of the individual resistance wires.
Claim 4
Dependent Claim
18 words
A laminated safety glass member as in claim 4 having parallel-connected electrode means to heat the resistance wires.
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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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |