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Patent US4701172A successfully refreshed from Google Patents.
Patent US3729357A successfully refreshed from Google Patents.
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US3729357A Expired / Lapsed US ⏱️ 0.0 years remaining

Thermoplastic heat sealing apparatus

Assignee: GEN HEAT SEALING CORP
•
Filing: 1971-06-25
•
Granted: 1973-04-24
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Expires: 1991-06-25
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Abstract

Abstract A LINEARLY EXTENDING SEAL OR WELD BETWEEN A PAIR OF HEAT SUSCEPTIBLE THERMOPLASTIC SHEETS ISPODUCED BY INTERPOSING THE THERMOPLASTIC SHEETS IN SUPERPOSITION BETWEEN A PAIR OF HEAT RESISTANT CONTROL SHEETS, AND SLIDING AN ELONGATED HEATING WIPER ALONG ITS AXIS IN CNTACT WITH ONE OF THE CONTROL SHEETS IN ORDER TO APPLY HEAT AND PRESSURE TO THE THERMOPLASTIC SHEETS WHILE COUNTERED BY THE OTHER OF THE CONTROL SHEETS. THERESULT IS A WELD CHARACTERIZED BY A TROUGH AT ONE FACE OF THE SUPERPOSED THERMOPLASTIC SHEET AND A RIDGE AT THE OTHER FACE OF THE SUPERPOSED THERMOPLASTIC SHEETS, THE TROUGH AND THE RIDGE BEING IN REGISTRATION AND THE REGION THEREBETWEEN BEING INTEGRATED. APPARATUS FOR EFFECTING THIS PROCESS AND PRODUCING THIS PRODUCT IS DISCLOSED.

Inventors

  • 👤 H Swartz

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 23:25
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/80; B29C66/83; B29C66/836; B29C65/00; B29C65/02; B29C65/18; B29C66/01; B29C66/02; B29C66/024; B29C66/0244; B29C66/03; B29C66/034; B29C66/0342; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/433; B29C66/47; B29C66/472; B29C66/70; B29C66/71; B29C66/712; B29C66/73; B29C66/735; B29C66/7352; B29C66/73521; B29C66/81; B29C66/814; B29C66/8141; B29C66/81427; B29C66/816; B29C66/8161; B29C66/818; B29C66/8181; B29C66/90; B29C66/91; B29C66/912; B29C66/9121; B29C66/91211; B29C66/91212; B29C66/91231; B29C66/914; B29C66/9141; B29C66/91411; B29C66/91421; B29C66/91431; B29C66/91441; B29C66/91443; B29C66/9161; B29C66/91641; B29C66/91643; B29C66/91645; B29C66/91651; B29C66/91655; B29C66/93; B29C66/934; B29C66/94; B29C66/944; B29C66/939; B29C66/96; B29C66/961; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/17; Y10T156/1702; Y10T156/1712; Y10T156/1737

Claims Analysis

Total Claims: 0
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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) 1976-04-23 1976-10-23 1977-04-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-04-23 1980-10-23 1981-04-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-04-23 1984-10-23 1985-04-24 $7700.00 Window Closed / Lapsed

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