US3868291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welding tool for forming synthetic-resin packages
Assignee: Individual
•
Filing: 1973-02-16
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Granted: 1975-02-25
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Expires: 1993-02-16
Abstract
Abstract A welding thermal fusion tool has a pair of concentric cutting and welding rings received in an annular downwardly open channel of a housing. A thin polytetrafluoroethylene sheet under these rings is pinched between the rings and a pair of thermoplastic foils to be welded together and cut. This polytetrafluoroethylene layer can be removably clamped at the outer edge of the channel for trimming the outside of a package or projects as a sheet from a central plug for trimming the center from an annular package.
Inventors
- 👤 Gottlieb Benz
- 👤 August Matzinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:33
CPC Classifications
B; B65; B65B; B65B51/00; B65B51/10; B65B51/14; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/24; B29C65/30; B29C65/305; B29C65/74; B29C65/745; B29C65/7461; B29C65/78; B29C65/7841; B29C66/00; B29C66/004; B29C66/0042; B29C66/0044; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/80; B29C66/81; B29C66/812; B29C66/8124; B29C66/81241; B29C66/814; B29C66/8145; B29C66/81457; B29C66/816; B29C66/8161; B29C66/8167; B29C66/83; B29C66/832; B29C66/8322; B29C66/84; B29C66/849; B29C66/20; B29C66/24; B29C66/242; B29C66/2422; B29C66/24221; B29C66/70; B29C66/71; B29C66/8122; Y; Y10; Y10T; Y10T156/00; Y10T156/12; Y10T156/1313; Y10T156/1378
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
145 words
An apparatus for welding together a pair of thermoplastic sheets, comprising: s support displaceable toward and away from said sheets; an annular welding element on said support engageable with said sheets; an annular cutting element on said support adjacent said welding element; a flat flexible and annular polytetrafluoroethylene foil having an inner periphery and an outer periphery and lying between said elements and said sheets, said elements and said foil being generally concentric; means for releasably securing one of said peripheries to said support while leaving the other periphery free for deflection of said annular foil toward and away from said sheets; means for heating said welding element to fuse said sheets together with said welding element pressing on said sheets through said foil; and means for heating said cutting element to a temperature above that of said welding element for severing of said sheets.
Claim 2
Independent Claim
145 words
An apparatus for welding together a pair of thermoplastic sheets, comprising: s support displaceable toward and away from said sheets; an annular welding element on said support engageable with said sheets; an annular cutting element on said support adjacent said welding element; a flat flexible and annular polytetrafluoroethylene foil having an inner periphery and an outer periphery and lying between said elements and said sheets, said elements and said foil being generally concentric; means for releasably securing one of said peripheries to said support while leaving the other periphery free for deflection of said annular foil toward and away from said sheets; means for heating said welding element to fuse said sheets together with said welding element pressing on said sheets through said foil; and means for heating said cutting element to a temperature above that of said welding element for severing of said sheets.
Claim 3
Dependent Claim
30 words
The apparatus defined in claim 1 wherein said elements are concentric arcuate rings, one of said elements being of smaller diameter than and surrounded by the other of said elements.
Claim 4
Dependent Claim
44 words
The apparatus defined in claim 2, further comprising an annular channel on said support open toward said sheets and having an inner side of smaller diameter than and surrounded by said elements and an outer side of greater diameter than and surrounding said elements.
Claim 5
Dependent Claim
31 words
The apparatus defined in claim 3, further comprising spring means between said channel and said welding element and said support biasing said channel and said welding element away from said support.
Claim 6
Dependent Claim
55 words
The apparatus defined in claim 3, further comprising a plug slidably mounted on said support and lying within said inner side of said channel, said foil extending outwardly as a skirt from said plug and under said elements, said cutting clement being within said welding element, whereby said inner periphery is secured to said plug.
Claim 7
Dependent Claim
21 words
The apparatus defined in claim 3 wherein said outer periphery is releasably secured on one of said sides of said channel.
Claim 8
Dependent Claim
20 words
The apparatus defined in claim 2 wherein said cutting element is of greater diameter than said surrounds said welding element.
Claim 9
Dependent Claim
20 words
The apparatus defined in claim 2 wherein said welding element is of greater diameter than and surrounds said cutting element.
Claim 10
Dependent Claim
17 words
The apparatus defined in claim 2 wherein said support includes a circular channel open toward said sheets.
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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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |