Patent US3788616A successfully refreshed from Google Patents.
Patent US5474558A successfully refreshed from Google Patents.
Patent US4390320A successfully refreshed from Google Patents.
Patent US3790420A successfully refreshed from Google Patents.
US3790420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a sunshade
Assignee: Motors Liquidation Co
•
Filing: 1971-11-08
•
Granted: 1974-02-05
•
Expires: 1991-11-08
Abstract
Abstract A method of forming a sunshade envelope in a dielectric embossing press having a pair of opposed electrodes with one of the electrodes having a sharp upstanding edge around a cavity formed in the electrode. The method comprises the steps of positioning a pair of superposed sheets of thermoplastic material over the cavity and closing the press so as to cause the sheets to be compressed between the electrodes along a tear line created by the upstanding edge. The portion of the thermoplastic sheets adjacent the upstanding edge are then positioned in axial alignment and abutting relationship along a vertical plane followed by applying a high frequency alternating current between the electrodes so as to establish a concentrated electric field at the upstanding edge that serves to fuse the sheets along the upstanding edge and along the vertical plane so as to maintain the portion of the sheets in axial alignment.
Inventors
- 👤 J Jenei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:54
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/26; B29C51/266; B29C51/267; B29C44/00; B29C44/02; B29C44/12; B29C44/14; B29C49/00; B29C49/02; B29C49/06905; B29C49/0691; B29C65/00; B29C65/02; B29C65/04; B29C65/74; B29C65/743; B29C65/7441; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/114; B29C66/1142; B29C66/13; B29C66/133; B29C66/20; B29C66/24; B29C66/242; B29C66/2422; B29C66/24221; B29C66/32; B29C66/328; B29C66/3282; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4326; B29C66/50; B29C66/51; B29C66/53; B29C66/532; B29C66/5326; B29C66/53261; B29C66/53262; B29C66/70; B29C66/73; B29C66/731; B29C66/7314; B29C66/73143; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/83; B29C66/832; B29C66/8322; B29C66/71; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1054; Y10T156/12; Y10T156/1313
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
244 words
A method of making an envelope in a dielectric heating press having a pair of opposed upper and lower electrodes, each of said electrodes having an identical cavity located therein with vertically orientated side walls for forming a chamber when the press is closed and one of said electrodes having a sharp upstanding continuous blade along the perimeter of the cavity thereof, said method comprising the steps of positioning a pair of superposed coextensive sheets of thermoplastic material on one of the electrodes so as to completely cover the cavity thereof and provide upper and lower sheets of thermoplastic material with parts of the sheets extending laterally beyond the cavity, closing the press so as to cause the thermoplastic material to be compressed between said electrodes along a tear line that is vertically aligned with said side walls and is created by said blade so as to form an envelope within the chamber, aligning a portion of the upper and lower sheets along the side walls of the upper and lower electrodes respectively so that the outer surfaces of the sheets within the cavity and along the side walls lie in a common plane that passes through said tear line, and applying a high frequency alternating current across said electrodes so as to establish a concentrated electric field at said blade that fuses said sheets together and joins the inner surfaces thereof so that said portion of the upper and lower sheets maintain alignment.
Claim 2
Independent Claim
244 words
A method of making an envelope in a dielectric heating press having a pair of opposed upper and lower electrodes, each of said electrodes having an identical cavity located therein with vertically orientated side walls for forming a chamber when the press is closed and one of said electrodes having a sharp upstanding continuous blade along the perimeter of the cavity thereof, said method comprising the steps of positioning a pair of superposed coextensive sheets of thermoplastic material on one of the electrodes so as to completely cover the cavity thereof and provide upper and lower sheets of thermoplastic material with parts of the sheets extending laterally beyond the cavity, closing the press so as to cause the thermoplastic material to be compressed between said electrodes along a tear line that is vertically aligned with said side walls and is created by said blade so as to form an envelope within the chamber, aligning a portion of the upper and lower sheets along the side walls of the upper and lower electrodes respectively so that the outer surfaces of the sheets within the cavity and along the side walls lie in a common plane that passes through said tear line, and applying a high frequency alternating current across said electrodes so as to establish a concentrated electric field at said blade that fuses said sheets together and joins the inner surfaces thereof so that said portion of the upper and lower sheets maintain alignment.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |