US4060443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the heat-sealing of thermoplastic material or paper material coated with thermoplastics
Assignee: Tetra Pak AB
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Filing: 1973-04-23
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Granted: 1977-11-29
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Expires: 1993-04-23
Abstract
Abstract A device to heat seal at least two thermoplastic layers using heat generated by the dielectric loss from a high frequency generator.
Inventors
- 👤 Gyula Balla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:34
CPC Classifications
B; B65; B65B; B65B51/00; B65B51/10; B65B51/22; B29; B29C; B29C65/00; B29C65/02; B29C65/04; B29C65/14; B29C65/1403; B29C65/1425; B29C65/1487; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/20; B29C66/23; B29C66/232; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/4312; B29C66/70; B29C66/72; B29C66/723; B29C66/7232; B29C66/72327; B29C66/72328; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/83; B29C66/832; B29C66/8322; B29C66/83221; B29C66/71; B29K; B29K2711/00; B29K2711/12; B29K2711/123
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
A device for heat sealing at least two layers of a thermoplastic material comprising a metal body having at least two substantially parallel side walls, a first metal wall connected to said side walls, a second metal wall connected to said first wall substantially equidistant from said side walls, a coaxial cable having a central conductor, a shield conductor, said central conductor being connected to said second wall, and shield conductor being connected to one of said side walls and means connecting said coaxial cable to a high frequency generator and a metal yoke connected to and spaced from said side walls to provide a space therebetween for the passage of a web of material.
Claim 2
Independent Claim
115 words
A device for heat sealing at least two layers of a thermoplastic material comprising a metal body having at least two substantially parallel side walls, a first metal wall connected to said side walls, a second metal wall connected to said first wall substantially equidistant from said side walls, a coaxial cable having a central conductor, a shield conductor, said central conductor being connected to said second wall, and shield conductor being connected to one of said side walls and means connecting said coaxial cable to a high frequency generator and a metal yoke connected to and spaced from said side walls to provide a space therebetween for the passage of a web of material.
Claim 3
Dependent Claim
20 words
The device of claim 1 wherein said side walls are connected by two other side walls to form a rectangle.
Claim 4
Dependent Claim
17 words
The device of claim 1 wherein said yoke is connected to said side walls by metal springs.
Claim 5
Dependent Claim
18 words
The device of claim 1 wherein said side walls are curved to reduce the height of the device.
Claim 6
Dependent Claim
12 words
The device of claim 4 wherein said side walls are substantially S-shaped.
Claim 7
Dependent Claim
21 words
The device of claim 1 wherein the end of said second metal wall away from said first metal wall is flared.
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) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |