Patent US3243487A successfully refreshed from Google Patents.
US3243487A
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Method and apparatus for heat sealing thermoplastic films
Assignee: Millennium Petrochemicals Inc
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Filing: 1962-08-14
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Granted: 1966-03-29
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Expires: 1982-08-14
Abstract
No abstract record available.
Inventors
- 👤 Willard F Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:15
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/80; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/83413; B29C65/00; B29C65/02; B29C65/18; B29C65/24; B29C65/30; B29C65/305; B29C65/74; B29C65/743; B29C65/7435; B29C65/749; B29C65/78; B29C65/7858; B29C65/7861; B29C65/787; B29C65/7873; B29C66/004; B29C66/0042; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/4312; B29C66/43121; B29C66/81; B29C66/814; B29C66/8141; B29C66/81411; B29C66/81415; B29C66/81419; B29C66/81427; B29C66/8145; B29C66/81457; B29C66/84; B29C66/849; B65; B65B; B65B51/00; B65B51/10; B65B51/16; B29C66/70; B29C66/71; B29C66/812; B29C66/8122; B29C66/81421; B29C66/81423; B29C66/90; B29C66/91; B29C66/914; B29C66/9141; B29C66/91421; B29C66/91431; B29C66/9161; B29C66/91641; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1054; Y10T156/108; Y10T156/12; Y10T156/1313
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
142 words
A METHOD OF FORMING A SEALED JUNCTURE BETWEEN LAYERED SHEETS OF A THERMOPLASTIC MATERIAL ALONG THE EDGES THEREOF, COMPRISING APPLYING HEAT AND PRESSURE TO SAID SHEETS IN A FIRST NARROWLY DEFINED AREA, BOUNDED BY SAID EDGES AND EXTENDING BETWEEN OPPOSITE SIDE EDGE PORTIONS OF SAID SHEETS, SUFFICIENT TO MELT AND TO STRIKE THROUGH THE MATERIAL THEREOF; EXTRUDING ALL OF THE MOLTEN SHEET MATERIAL FROM SAID AREA, UNDER SAID APPLIED PRESSURE, AND AT LEAST PARTIALLY INTO A SECOND NARROWLY DEFINED AREA OF SAID SHEETS, COEXTENSIVE WITH SAID FIRST AREA AND NEXT ADJOINING AREA; SIMULTANEOUSLY APPLYING HEAT AND PRESSURE TO SAID SHEET MATERIAL IN SAID SECOND AREA, SUFFICIENT AT LEAST SUBSTANTIALLY TO SOFTEN SAID SHEET MATERIAL; AND UNDER SAID APPLIED PRESSURE, IN SAID SECOND AREA, MOLDING SAID SHEETS AND MOLTEN MATERIAL TO FORM A SUBSTANTIALLY HOMOGENEOUS, FUSED SEAL STRIP COMMON TO SAID LAYERED SHEETS.
Claim 2
Independent Claim
142 words
A METHOD OF FORMING A SEALED JUNCTURE BETWEEN LAYERED SHEETS OF A THERMOPLASTIC MATERIAL ALONG THE EDGES THEREOF, COMPRISING APPLYING HEAT AND PRESSURE TO SAID SHEETS IN A FIRST NARROWLY DEFINED AREA, BOUNDED BY SAID EDGES AND EXTENDING BETWEEN OPPOSITE SIDE EDGE PORTIONS OF SAID SHEETS, SUFFICIENT TO MELT AND TO STRIKE THROUGH THE MATERIAL THEREOF; EXTRUDING ALL OF THE MOLTEN SHEET MATERIAL FROM SAID AREA, UNDER SAID APPLIED PRESSURE, AND AT LEAST PARTIALLY INTO A SECOND NARROWLY DEFINED AREA OF SAID SHEETS, COEXTENSIVE WITH SAID FIRST AREA AND NEXT ADJOINING AREA; SIMULTANEOUSLY APPLYING HEAT AND PRESSURE TO SAID SHEET MATERIAL IN SAID SECOND AREA, SUFFICIENT AT LEAST SUBSTANTIALLY TO SOFTEN SAID SHEET MATERIAL; AND UNDER SAID APPLIED PRESSURE, IN SAID SECOND AREA, MOLDING SAID SHEETS AND MOLTEN MATERIAL TO FORM A SUBSTANTIALLY HOMOGENEOUS, FUSED SEAL STRIP COMMON TO SAID LAYERED SHEETS.
Claim 3
Independent Claim
117 words
AN APPARATUS FOR FORMING A FUSED JUNCTURE BETWEEN OPPOSED SURFACES OF LAYERED SHEETS OF THERMOPLASTIC MATERIAL, COMPRISING A PAIR OF HEATED PLATENS; CORRESPONDING EDGE PORTIONS ON SAID RESPECTIVE PLATENS, WHEREIN EACH SAID EDGE PORTION INCLUDES SIMILARLY DISPOSED CONTIGUOUS CONTACT AND CHAMFERED SURFACE AREAS NARROWLY DEFINED IN SAID EDGE PORTION TO HAVE A COMMON BOUNDARY THEREIN AND COEXTENSIVE THEREWITH; MEANS FOR MOVING SAID PLATENS TO BRING SAID RESPECTIVE CONTACT SURFACE AREAS OF SAID PLATENS INTO SURFACE TO SURFACE CONTACT RELATION; AND MEANS FOR HEATING SAID PLATENS; SAID MEANS FOR HEATING SAID PLATENS IN DIRECT CONTACT WITH SAID PLATENS AND HEATING EACH OF SAID CONTIGUOUS CONTACT AREAS TO BA TEMPERATURE SUFFICIENT TO MELT SAID LAYERED SHEETS OF THERMOPLASTIC MATERIAL.
Claim 4
Independent Claim
117 words
AN APPARATUS FOR FORMING A FUSED JUNCTURE BETWEEN OPPOSED SURFACES OF LAYERED SHEETS OF THERMOPLASTIC MATERIAL, COMPRISING A PAIR OF HEATED PLATENS; CORRESPONDING EDGE PORTIONS ON SAID RESPECTIVE PLATENS, WHEREIN EACH SAID EDGE PORTION INCLUDES SIMILARLY DISPOSED CONTIGUOUS CONTACT AND CHAMFERED SURFACE AREAS NARROWLY DEFINED IN SAID EDGE PORTION TO HAVE A COMMON BOUNDARY THEREIN AND COEXTENSIVE THEREWITH; MEANS FOR MOVING SAID PLATENS TO BRING SAID RESPECTIVE CONTACT SURFACE AREAS OF SAID PLATENS INTO SURFACE TO SURFACE CONTACT RELATION; AND MEANS FOR HEATING SAID PLATENS; SAID MEANS FOR HEATING SAID PLATENS IN DIRECT CONTACT WITH SAID PLATENS AND HEATING EACH OF SAID CONTIGUOUS CONTACT AREAS TO BA TEMPERATURE SUFFICIENT TO MELT SAID LAYERED SHEETS OF THERMOPLASTIC MATERIAL.
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) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |