US3671709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat sealing of porous materials
Assignee: Monsanto Co
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Filing: 1970-09-14
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Granted: 1972-06-20
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Expires: 1990-09-14
Abstract
Abstract An apparatus for seam bonding layers of fabric by radio frequency power is provided with electrodes at least one of which is flanked by and is recessed in a resilient insulating member which acts to fill the voids in the fabric during bonding and resultingly prevents electrical arcing through the fabric.
Inventors
- 👤 Lester Gidge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:13
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; B; B29; B29C; B29C65/00; B29C65/02; B29C65/04; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/32; B29C66/324; B29C66/347; B29C66/3472; B29C66/40; B29C66/41; B29C66/43; B29C66/70; B29C66/72; B29C66/727; B29C66/729; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/814; B29C66/8141; B29C66/81411; B29C66/81415; B29C66/81419; B29C66/8145; B29C66/81457; B29C66/818; B29C66/8187; B29C66/81871; B29C66/83; B29C66/832; B29C66/8322; B29C66/71; B29C66/812; B29C66/8122; B29K; B29K2313/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
An apparatus for the dielectric heat-sealing of porous articles in lamina form, said articles containing a thermoplastic material being readily excitable by radio frequency energy, said apparatus comprising a pair of relatively moving electrodes capable of compressing said articles into intimate contact with one of said electrodes being flanked by and being recessed in a resilient insulating member, said resilient member upon the compression of said articles work against the other electrode to engage said porous articles and substantially fill the voids therein, said flanked electrode having its face flush with said resilient insulating member while said members are in compression, means for moving said electrodes relatively towards each other and for compressing said resilient insulating member and means for supplying radio frequency power to said electrodes for bonding said thermoplastic materials.
Claim 2
Independent Claim
132 words
An apparatus for the dielectric heat-sealing of porous articles in lamina form, said articles containing a thermoplastic material being readily excitable by radio frequency energy, said apparatus comprising a pair of relatively moving electrodes capable of compressing said articles into intimate contact with one of said electrodes being flanked by and being recessed in a resilient insulating member, said resilient member upon the compression of said articles work against the other electrode to engage said porous articles and substantially fill the voids therein, said flanked electrode having its face flush with said resilient insulating member while said members are in compression, means for moving said electrodes relatively towards each other and for compressing said resilient insulating member and means for supplying radio frequency power to said electrodes for bonding said thermoplastic materials.
Claim 3
Dependent Claim
13 words
The apparatus of claim 1 wherein said porous articles are layers of fabric.
Claim 4
Dependent Claim
14 words
The apparatus of claim 1 wherein said porous articles are layers of non-woven fabric.
Claim 5
Dependent Claim
19 words
The apparatus of claim 1 wherein said porous articles are layers of spunbonded fabric comprised of continuous nylon filaments.
Claim 6
Dependent Claim
15 words
The apparatus of claim 1 wherein said resilient insulating members are comprised of silicone rubber.
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |