US3864545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for heating solid surfaces
Assignee: Saint Gobain Industries SA
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Filing: 1972-09-27
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Granted: 1975-02-04
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Expires: 1992-09-27
Abstract
Abstract The heating of solid surfaces by grids of fine line is made balanceable and controllable by building into the grid a network of resistances which can be altered at will by the severance or introduction of current carrying conductors which form part of the grid.
Inventors
- 👤 Wolfgang Schafer
- 👤 Helmut Brook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:30
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/84; H05B2203/00; H05B2203/002; H05B2203/016
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
169 words
A window comprising a transparent sheet, a plurality of opaque resistive conductors substantially coextensive in length adhered in spaced substantially parallel relation to a surface of the sheet, said conductors having a width small compared to their spacing, at least two bus bands made of electrically conductive material and having a width wider than said conductors, said bus bands adhered to said surface of the sheet and connecting said conductors electrically in parallel, a current terminal connecting to each of said bus bands, and at least one of said bus bands having elongated aperture means therethrough extending lengthwise of said bus band with an end of said aperture means close to said terminal, said conductive material being removable selectively from said sheet whereby upon said selective removal over a path extending from said aperture means to the outer periphery of said at least one bus band the current path between the current terminal connecting to said at least one bus band and said conductors will be increased in length.
Claim 2
Dependent Claim
169 words
A window comprising a transparent sheet, a plurality of opaque resistive conductors substantially coextensive in length adhered in spaced substantially parallel relation to a surface of the sheet, said conductors having a width small compared to their spacing, at least two bus bands made of electrically conductive material and having a width wider than said conductors, said bus bands adhered to said surface of the sheet and connecting said conductors electrically in parallel, a current terminal connecting to each of said bus bands, and at least one of said bus bands having elongated aperture means therethrough extending lengthwise of said bus band with an end of said aperture means close to said terminal, said conductive material being removable selectively from said sheet whereby upon said selective removal over a path extending from said aperture means to the outer periphery of said at least one bus band the current path between the current terminal connecting to said at least one bus band and said conductors will be increased in length.
Claim 3
Dependent Claim
24 words
A window according to claim 1 in which said aperture means defines in said one bus band two elongate conductive portions of unequal width.
Claim 4
Dependent Claim
33 words
A window according to claim 1 wherein each said terminal connects to each of said bus bands in the region of one end, and said elongated aperture means comprises at least one slot.
Claim 5
Dependent Claim
83 words
A window according to claim 3 wherein said elongated aperture means comprises a pair of slots, one of said slots extending betWeen points closer to and further from said terminal than any one of said conductors, the other of said slots being arranged parallel to said one slot ahd having a length less than said one slot, and wherein said conductive material is removed from said bus band between said one slot near said closer point and said periphery of said bus band.
Claim 6
Dependent Claim
43 words
A window according to claim 4 wherein additional conductive material is removed over a path between an end of said other slot remote from said terminal and said bus band periphery to further increase the current path between said terminal and said conductors.
Claim 7
Dependent Claim
108 words
A window according to claim 1 wherein each of said terminals is connected to said bus bands between the ends, and said elongated aperture means includes at least two individual slots, at least one of said slots being arranged to one side of said terminal and at least one of said slots being arranged to the other side of said terminal, and said selective removal of conductive material from said sheet being carried out over paths each extending substantially from a proximal end of each slot closest to said terminal to said periphery of said bus band to increase the current path between said terminal and said conductors.
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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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |