Patent US3272674A successfully refreshed from Google Patents.
US3272674A
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Plastic film welding process and apparatus
Assignee: Union Carbide Corp
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Filing: 1962-05-28
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Granted: 1966-09-13
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Expires: 1982-05-28
Abstract
No abstract record available.
Inventors
- 👤 John P Sachs
- 👤 Howard E Kasting
- 👤 Alvin E Ericson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:42
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/80; B29C65/00; B29C65/02; B29C65/18; B29C65/24; B29C65/30; B29C65/305; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/4312; B29C66/43121; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/81; B29C66/814; B29C66/8141; B29C66/81427; B29C66/8145; B29C66/81457; B29C66/818; B29C66/8181; B29C66/83; B29C66/832; B29C66/8322; B29C66/84; B29C66/849; B29C66/90; B29C66/91; B29C66/914; B29C66/9141; B29C66/91421; B29C66/91431; B29C66/919; B29C66/92; B29C66/924; B29C66/9241; B29C66/9261; B29C66/92651; B29C66/92653; B65; B65B; B65B51/00; B65B51/10; B65B51/14; B29C66/71; B29C66/812; B29C66/8126; B29C66/81264; B29C66/929; B29C66/94; B29C66/949; B29C66/95; B29C66/954
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
METHOD OF PRESSURE WELDING THERMOPLASTIC FILMS WHICH COMPRISES COMPRESSING THE OVERLAPPING FILM MATERIAL BETWEEN A BACKUP SURFACE, AND A PLATEN IN AN AREA CLOSELY AND COMPLETELY SURROUNDING THE WELD TO BE MADE, LIGNIN-ENRICHED PHASE CONTAINING SAID PYRROLIDONE FROM A ING WITH HEAT AND UNDER PRESSURE SUCH MATERIAL WHILE IT IS SO COMPRESSED, BY ADVANCING THE HOT SEALING SURFACE OF A HEAT-SEALING BAR INTO CONTACT WITH SUCH MATERIAL WITHIN SUCH AREA AFTER COMPRESSING THE OVERLAPPING FILM, WITH HEAT AND PRESSURE SUFFICIENT ONLY TO WELD THE MATERIAL TOGETHER, WHILE CONTROLLING THE DEGREE OF COMPRESSION OF SUCH MATERIAL BETWEEN SAID PLATEN AND BACKUP SURFACE BY VARIABLY LIMITING THE ADVANCING OF SAID HEAT SEALING SURFACE TOWARD SAID BACKUP SURFACE, SIMULTANEOUSLY COOLING SUCH PLATEN DURING SUCH WELDING OPERATION, AND FINALLY, FIRST RETRACTING SAID SEALING SURFACE FROM THE WELD AND THEN RELEASING THE SO-WELDED MATERIAL FROM SUCH COMPRESSION BY WITHDRAWING SAID PLATEN TO AVOID SPRINGBACK AND BULGING OF THE FILM PLIES.
Claim 2
Dependent Claim
155 words
METHOD OF PRESSURE WELDING THERMOPLASTIC FILMS WHICH COMPRISES COMPRESSING THE OVERLAPPING FILM MATERIAL BETWEEN A BACKUP SURFACE, AND A PLATEN IN AN AREA CLOSELY AND COMPLETELY SURROUNDING THE WELD TO BE MADE, LIGNIN-ENRICHED PHASE CONTAINING SAID PYRROLIDONE FROM A ING WITH HEAT AND UNDER PRESSURE SUCH MATERIAL WHILE IT IS SO COMPRESSED, BY ADVANCING THE HOT SEALING SURFACE OF A HEAT-SEALING BAR INTO CONTACT WITH SUCH MATERIAL WITHIN SUCH AREA AFTER COMPRESSING THE OVERLAPPING FILM, WITH HEAT AND PRESSURE SUFFICIENT ONLY TO WELD THE MATERIAL TOGETHER, WHILE CONTROLLING THE DEGREE OF COMPRESSION OF SUCH MATERIAL BETWEEN SAID PLATEN AND BACKUP SURFACE BY VARIABLY LIMITING THE ADVANCING OF SAID HEAT SEALING SURFACE TOWARD SAID BACKUP SURFACE, SIMULTANEOUSLY COOLING SUCH PLATEN DURING SUCH WELDING OPERATION, AND FINALLY, FIRST RETRACTING SAID SEALING SURFACE FROM THE WELD AND THEN RELEASING THE SO-WELDED MATERIAL FROM SUCH COMPRESSION BY WITHDRAWING SAID PLATEN TO AVOID SPRINGBACK AND BULGING OF THE FILM PLIES.
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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |