Patent US5268218A successfully refreshed from Google Patents.
Patent US4883450A successfully refreshed from Google Patents.
US4883450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making single side free plastic bag
Assignee: Pactiv LLC
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Filing: 1987-11-02
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Granted: 1989-11-28
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Expires: 2007-11-02
Abstract
Abstract The present invention is a method of continuously making thermoplastic film bags having one-side-free for separation from an opposite side. The method includes providing a continuous tube of thermoplastic film for formation of the bag, such tube having a continuous surface which forms opposing sides of the bags. The tube is directed to a bag forming means which continuously flattens the tube into at least the opposing sides of the bag. The tube must intermittently be partially severed on one of the opposing sides at intervals corresponding to single bag lengths, such severance being made at a location for providing detachable separation of the one wall from the opposing wall. Next a sealed seam is formed across the tube at intervals which provide bottoms to each of the bags, and the bags are then collected in a stack where they are substantially aligned followed by fusing the stack of substantially aligned bags adjacent the severance in the one side for separating the bags from stack one side at a time.
Inventors
- 👤 Gordon L. Benoit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:05
CPC Classifications
B; B31; B31B; B31B70/00; B31B2155/00; B31B2155/003; B31B2160/00; B31B2160/10; B31B70/14; B31B70/16; Y; Y10; Y10S; Y10S493/00; Y10S493/916; Y10S493/926
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
166 words
A method of continually making thermoplastic film bags having one side substantially free for separation from an opposite side; comprising: providing a continuous tube of thermoplastic film for formation of said bags, said tube having a continuous wall which forms opposing front and rear sides; separating said front and rear sides of said continuous wall from each other; intermittently at least partially cutting one of said opposing sides of said continuous wall of said continuous tube at intervals corresponding to single bag lengths, thereby providing cuts therein at said intervals; forming sealed seams across said continuous tube at intervals which provide sealed bottom ends for said bags; and severing said continuous tube at intervals to separate individual bags from said continuous tube such that each of said separated individual bags includes front and rear sides formed from said front and rear sides of said continuous wall of said continuous tube, top and bottom ends, and a cut within one of said front and rear sides thereof.
Claim 2
Independent Claim
166 words
A method of continually making thermoplastic film bags having one side substantially free for separation from an opposite side; comprising: providing a continuous tube of thermoplastic film for formation of said bags, said tube having a continuous wall which forms opposing front and rear sides; separating said front and rear sides of said continuous wall from each other; intermittently at least partially cutting one of said opposing sides of said continuous wall of said continuous tube at intervals corresponding to single bag lengths, thereby providing cuts therein at said intervals; forming sealed seams across said continuous tube at intervals which provide sealed bottom ends for said bags; and severing said continuous tube at intervals to separate individual bags from said continuous tube such that each of said separated individual bags includes front and rear sides formed from said front and rear sides of said continuous wall of said continuous tube, top and bottom ends, and a cut within one of said front and rear sides thereof.
Claim 3
Dependent Claim
40 words
A method as defined in claim 1 including the step of forming a handle and bag mouth opening at said top end of each of said individual bags such that said cut intersects said bag mouth opening at two points.
Claim 4
Dependent Claim
51 words
A method as defied in claim 2 including the step of forming said bag mouth opening such that said top end of each of said individual bags includes a pair of opposing handles and a tab extending towards said top end of said individual bag, said cut extending across said tab.
Claim 5
Dependent Claim
34 words
A method as defined in claim 3 including the step of providing a line of perforations across said tab and between said cut and the top end of said top of each individual bag.
Claim 6
Dependent Claim
34 words
A method as defined in claim 4 including the step of providing a hang hole through the tab of each individual bag between said line of perforations and the top end of said tab.
Claim 7
Dependent Claim
24 words
A method as defined in claim 5 including the steps of stacking said individual bags and bonding said tabs of said individual bags together.
Claim 8
Dependent Claim
37 words
A method as defined in claim 1 including the step of providing a gusseting box, and intermittently cutting said one of said opposing sides of said continuous wall while said continuous tube passes through said gusseting box.
Claim 9
Dependent Claim
51 words
A method as defined in claim 7 including the steps of providing a rotatable blade holder and a blade secured to said rotatable blade holder, and intermittently rotating said blade through said gusset box, thereby imtermittently cutting said one of said opposing sides of said continuous wall of said continuous tube.
Claim 10
Dependent Claim
34 words
A method as defined in claim 1 wherein said step of cutting said one of said opposing sides of said continuous wall includes slicing said one of said opposing sides with a cutting blade.
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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) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |