US4266339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making rolling electrode for electrostatic device
Assignee: Dielectric Systems International Inc
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Filing: 1979-06-07
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Granted: 1981-05-12
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Expires: 1999-06-07
Abstract
Abstract A method for making a rolling electrode for use in an electrostatically controllable device includes depositing a metal film on only one surface of a tentered plastic sheet, heating to a temperature substantially above the softening temperature of the plastic and cooling to shrink the plastic and to cause the plastic sheet to form a tight roll.
Inventors
- 👤 Charles G. Kalt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:55
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/02; E; E06; E06B; E06B9/00; E06B9/24; G09; G09F; G09F9/00; G09F9/30; G09F9/37; G09F9/372; E06B2009/2464; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
116 words
A method for making an electrostatically controllable device having a rolling electrode comprising: (a) depositing a metal film on only one side of a tentered plastic sheet; (b) heating said tentered sheet to a temperature greater than that corresponding to the 0.5 percent tenter-relief shrinkage characteristic of said sheet; (c) cooling said sheet to shrink said plastic and to cause said metallized sheet to cure metal-outward to form a tight roll; and (d) attaching the outermost end of said roll to an insulated surface of a fixed electrode so that when a voltage is impressed between said metallized plastic sheet and said fixed electrode, said tight roll is attracted to said fixed electrode and is unrolled.
Claim 2
Independent Claim
116 words
A method for making an electrostatically controllable device having a rolling electrode comprising: (a) depositing a metal film on only one side of a tentered plastic sheet; (b) heating said tentered sheet to a temperature greater than that corresponding to the 0.5 percent tenter-relief shrinkage characteristic of said sheet; (c) cooling said sheet to shrink said plastic and to cause said metallized sheet to cure metal-outward to form a tight roll; and (d) attaching the outermost end of said roll to an insulated surface of a fixed electrode so that when a voltage is impressed between said metallized plastic sheet and said fixed electrode, said tight roll is attracted to said fixed electrode and is unrolled.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said sheet is selected from polyethylene terephthalate, polyimide, polysulfone, and polyfluorocarbon.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein said sheet is polyethylene terephthalate and said heating is at a temperature greater than 110° C.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein said sheet is polyimide and said heating is at a temperature greater than 300° C.
Claim 6
Dependent Claim
33 words
The method of claim 1 wherein said heating is accomplished by applying heat to said sheet in a line perpendicular to the desired direction of curling and sweeping said line across said sheet.
Claim 7
Dependent Claim
29 words
The method of claim 5 additionally comprising holding one edge portion of said metallized sheet during said heating, said sweeping being in a direction away from said held edge.
Claim 8
Dependent Claim
13 words
The method of claim 1 additionally comprising stiffening one end of said sheet.
Claim 9
Dependent Claim
30 words
The method of claim 7 whereby said stiffening is accomplished by selectively heating said one end to a temperature greater than that of said heating to curl said sheet .
Claim 10
Independent Claim
71 words
A method for making a plurality of rolling electrodes comprising: (a) depositing a metal film on only one side of a tentered plastic sheet; (b) cutting through said sheet to form a plurality of U-shaped incisions in said sheet; (c) heating said sheet; and (d) cooling said sheet to cause each of the portions of said sheet being within one of said U-shaped incisions to curl and form a tight roll.
Claim 11
Independent Claim
71 words
A method for making a plurality of rolling electrodes comprising: (a) depositing a metal film on only one side of a tentered plastic sheet; (b) cutting through said sheet to form a plurality of U-shaped incisions in said sheet; (c) heating said sheet; and (d) cooling said sheet to cause each of the portions of said sheet being within one of said U-shaped incisions to curl and form a tight roll.
Claim 12
Dependent Claim
40 words
The method of claim 9 additionally comprising placing a heat shield over said sheets prior to said heating, said shield having openings in areas corresponding to the areas of said sheet that are encompassed by each of said U-shaped incisions.
Claim 13
Dependent Claim
13 words
The method of claim 9 wherein said shield is made of sheet metal.
Claim 14
Dependent Claim
28 words
The method of claim 11 additionally comprising bonding the portion of said sheet without said U-shaped incisions to an insulated fixed electrode to form a multiple-variable-electrode electrostatically-controllable device.
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) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |