Patent US3647607A successfully refreshed from Google Patents.
US3647607A
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High frequency welding of polyvinyl chloride foams to perforated materials
Assignee: Dynamit Nobel AG
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Filing: 1970-06-05
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Granted: 1972-03-07
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Expires: 1990-06-05
Abstract
Abstract THE HIGH FREQUENCY WELDING OF POLYVINYL CHLORIDE FOAMS TO SIEVELIKE PERFORATED MATERIALS, SUCH AS TRICOT, NETTLE CLOTH, PERFORATED FILMS AND THE LIKE, IS CONDUCTED IN ORDER TO OBTAIN A HIGH WELDING SEAM STRENGTH BY PROVIDING THE SIDE OF THE INSULATING LAYER FACING THE MATERIAL TO BE WELDED WITH NUMEROUS, RELATIVELY SMALL PROJECTIONS AND/OR DEPRESSIONS. THE PVC FOAM, HEATED AND PLASTICIZED BY THE HIGH FREQUENCY CURRENT, PENETRATES THROUGH THE FABRIC TO BETWEEN THE PROJECTIONS OR INTO THE DEPRESSIONS AND THUS BECOMES MECHANICALLY ANCHORED IN THE FABRIC AFTER COOLING.
Inventors
- 👤 Theo Hillers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:18
CPC Classifications
B; B29; B29C; B29C37/00; B29C37/0078; B29C37/0082; B32; B32B; B32B38/00; B32B38/0008; B29C65/00; B29C65/02; B29C65/04; B29C66/00; B29C66/004; B29C66/0042; B29C66/0044; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/303; B29C66/3032; B29C66/30321; B29C66/30325; B29C66/3034; B29C66/40; B29C66/41; B29C66/43; B29C66/436; B29C66/70; B29C66/71; B29C66/72; B29C66/723; B29C66/7232; B29C66/72327; B29C66/72328; B29C66/727; B29C66/729; B29C66/80; B29C66/83; B29C66/832; B29C66/8322; B32B5/00; B32B5/18; A; A61; A61H; A61H2201/00; A61H2201/16; A61H2201/1683; A61H2201/169; A61H2201/1697; B29K; B29K2027/00; B29K2027/06; B29K2105/00; B29K2105/04; B29K2313/00; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0221; B32B2266/0235; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1039; Y10T156/1041; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24331; Y10T428/24339; Y10T428/24479; Y10T428/24496; Y10T428/24504; Y10T428/24521
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |