US4704101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making a puncture resistant bag
Assignee: Cryovac LLC
•
Filing: 1986-09-17
•
Granted: 1987-11-03
•
Expires: 2006-09-17
Abstract
Abstract A seamless, puncture resistant bag is made by advancing a lay-flat seamless tube of thermoplastic film; forming an alternating series of fused-unfused segments along said lay-flat tube by internally fusing said lay-flat tube at regular intervals, the unfused segment length being approximately equal to the fused segment length; treating the external surface of the lay-flat tube to render said surface self adherent; periodically folding back the lay-flat tube towards its treated surface at the juncture between the leading fused-unfused segments of the lay-flat tube; pressing the folded portion of the lay-flat tube; and severing the folded portion from the tube.
Inventors
- 👤 Henry G. Schirmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:39
CPC Classifications
B; B65; B65D; B65D31/00; B65D31/04; B31; B31B; B31B2155/00; B31B2170/00; B31B2170/20; B65D2275/00; B65D2275/02; Y; Y10; Y10S; Y10S493/00; Y10S493/916; Y10S493/933
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
126 words
A method for making seamless, puncture resistant bags suitable for packaging meat articles having sections of protruding bone, said method comprising: (a) advancing a lay-flat seamless tube of thermoplastic film; (b) forming an alternating series of fused-unfused segments along said lay-flat tube by internally fusing said lay-flat tube at regular intervals, the unfused segment length being approximately equal to the fused segment length; (c) treating an external surface of said lay-flat tube to render said surface self-adherent; and (d) periodically, corresponding to said intervals, (i) folding back said lay-flat tube, toward its adherently treated surface, at the juncture between the leading fused-unfused segments of said lay-flat tube, (ii) pressing the thus folded portion of said lay-flat tube, and (iii) severing the folded portion from the tube.
Claim 2
Independent Claim
126 words
A method for making seamless, puncture resistant bags suitable for packaging meat articles having sections of protruding bone, said method comprising: (a) advancing a lay-flat seamless tube of thermoplastic film; (b) forming an alternating series of fused-unfused segments along said lay-flat tube by internally fusing said lay-flat tube at regular intervals, the unfused segment length being approximately equal to the fused segment length; (c) treating an external surface of said lay-flat tube to render said surface self-adherent; and (d) periodically, corresponding to said intervals, (i) folding back said lay-flat tube, toward its adherently treated surface, at the juncture between the leading fused-unfused segments of said lay-flat tube, (ii) pressing the thus folded portion of said lay-flat tube, and (iii) severing the folded portion from the tube.
Claim 3
Independent Claim
121 words
A method for making puncture resistant bags suitable for packaging meat articles having sections of protruding bone, said method comprising: (a) advancing a lay-flat seamless tube of thermoplastic film; (b) fusing the internal surfaces of said lay-flat tube to one side of its central longitudinal axis; (c) treating an external surface of said lay-flat tube to render said surface self-adherent; (d) folding the fused and treated tube along its central longitudinal axis toward its adherently treated surface, a collapsed edge being formed; (e) transversely heat sealing the folded tube at regular intervals along the tube, the transverse seals forming the bag sides; and (f) cutting along the collapsed edge of said lay-flat tube to provide a bag mouth for each bag.
Claim 4
Independent Claim
121 words
A method for making puncture resistant bags suitable for packaging meat articles having sections of protruding bone, said method comprising: (a) advancing a lay-flat seamless tube of thermoplastic film; (b) fusing the internal surfaces of said lay-flat tube to one side of its central longitudinal axis; (c) treating an external surface of said lay-flat tube to render said surface self-adherent; (d) folding the fused and treated tube along its central longitudinal axis toward its adherently treated surface, a collapsed edge being formed; (e) transversely heat sealing the folded tube at regular intervals along the tube, the transverse seals forming the bag sides; and (f) cutting along the collapsed edge of said lay-flat tube to provide a bag mouth for each bag.
Claim 5
Dependent Claim
111 words
Method for making puncture resistant bags suitable for packaging meat articles having sections of protruding bone, said method comprising: (a) advancing a lay-flat seamless tube of thermoplastic film; (b) fusing the internal surfaces of said lay-flat tube to one side of its central longitudinal axis; (c) treating an external surface of said lay-flat tube to render said surface self-adherent; (d) folding the fused and treated tube along its central longitudinal axis toward its adherently treated surface; and (e) transversely heat sealing and perforating the folded tube at regular intervals along the tube; the transverse seals forming the bag ends and the lines of perforation providing a means of separating the bags.
Claim 6
Dependent Claim
111 words
Method for making puncture resistant bags suitable for packaging meat articles having sections of protruding bone, said method comprising: (a) advancing a lay-flat seamless tube of thermoplastic film; (b) fusing the internal surfaces of said lay-flat tube to one side of its central longitudinal axis; (c) treating an external surface of said lay-flat tube to render said surface self-adherent; (d) folding the fused and treated tube along its central longitudinal axis toward its adherently treated surface; and (e) transversely heat sealing and perforating the folded tube at regular intervals along the tube; the transverse seals forming the bag ends and the lines of perforation providing a means of separating the bags.
References Cited (Backward Citations)
US1027168A
Cited
US1941272A
Cited
US2623441A
Cited
US2593608A
Cited
GB777279A
Cited
US2837979A
Cited
DE1063024B
Cited
US2978853A
Cited
US3194124A
Cited
US3254828A
Cited
US3259301A
Cited
US3550839A
Cited
JPS4831345A
Cited
US3779139A
Cited
US3908522A
Cited
US3869842A
Cited
CA1035741A
Cited
US4182222A
Cited
DE2922989A1
Cited
US4273549A
Cited
US4267960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-02 | 1991-05-04 | 1991-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-02 | 1995-05-04 | 1995-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-02 | 1999-05-04 | 1999-11-03 | $7700.00 | Window Closed / Lapsed |