Patent US4561109A successfully refreshed from Google Patents.
US4561109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic bags with releasable closure which resists opening from inside
Assignee: Pactiv LLC
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Filing: 1984-06-22
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Granted: 1985-12-24
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Expires: 2004-06-22
Abstract
Abstract A flexible bag has a releasable closure with a fin extending away from one of the mating pluralities of hook-like protrusions. The fin is joined to the base of the hook-like protrusions to apply disengaging force for opening the closure from the outside of the bag. The closure resists opening force from inside the bag. The protrusions have hook-like ends which have the same shape on all protrusions, which extend in one direction on one of the plurality of protrusions and in the other direction on the other plurality of protrusions. The protrusions are easily extruded from molten thermoplastic and applied to a moving web of film during an in-line bag manufacturing process.
Inventors
- 👤 Fox J. Herrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:57
CPC Classifications
B; B65; B65D; B65D33/00; B65D33/16; B65D33/25; B65D33/2508; B65D33/2541; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/47; B29C66/474; B29C66/80; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/83413; B29C66/83415; B29C65/022; B29C65/028; B29C66/832; B29C66/8322; B29L; B29L2005/00; B29L2031/00; B29L2031/712; B29L2031/7128; B31; B31B; B31B70/00; B31B70/74; B31B70/81; B31B70/813; B31B70/8131; B31B70/8132; Y; Y10; Y10S; Y10S24/00; Y10S24/30; Y10S24/38; Y10S24/39; Y10S24/50; Y10T; Y10T24/00; Y10T24/45; Y10T24/45152; Y10T24/45157; Y10T24/45168; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/24; Y10T428/24008
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
301 words
A flexible bag, comprising: first and second sheets joined at the bottom and sides thereof, and releasably joined near the top thereof to form a closable bag opening; releasably closing means extending from near the tops of said first and second sheets and across said bag opening, comprising: first releasing means extending from said first sheet toward said second sheet and comprising first and second downwardly-opening, hook-like locking protrusions integrally connected to a first common base attached to said first sheet; second releasing means extending from said second sheet toward said first sheet and comprising third and fourth upwardly-opening, hook-like locking protrusions integrally connected to a second common base attached to said second sheet for releasably engaging with said first and second hook-like locking protrusions respectively; said first and second releasing means being positioned so that said third protrusion extends between said first and second protrusions and said second protrusion extends between said third and fourth protrusions; said first releasing means further comprising a fin extending towards the top of said first sheet from said first common base and being integrally connected with said first common base and attached to said first sheet, said fin causing the first protrusion of said first releasing means to pivot away from engaging with the third protrusion of said second releasing means to facilitate opening of the bag from outside thereof, said second releasing means having no portion thereof which overlies said first protrusion and which is contactable by said first protrusion as it pivots away from said third protrusion, and a weak point in said first common base located between said first and second protrusions defining a pivot point to further facilitate pivoting of said first protrusion away from said third protrusion upon the application of disengaging force from the outside of the bag.
Claim 2
Dependent Claim
301 words
A flexible bag, comprising: first and second sheets joined at the bottom and sides thereof, and releasably joined near the top thereof to form a closable bag opening; releasably closing means extending from near the tops of said first and second sheets and across said bag opening, comprising: first releasing means extending from said first sheet toward said second sheet and comprising first and second downwardly-opening, hook-like locking protrusions integrally connected to a first common base attached to said first sheet; second releasing means extending from said second sheet toward said first sheet and comprising third and fourth upwardly-opening, hook-like locking protrusions integrally connected to a second common base attached to said second sheet for releasably engaging with said first and second hook-like locking protrusions respectively; said first and second releasing means being positioned so that said third protrusion extends between said first and second protrusions and said second protrusion extends between said third and fourth protrusions; said first releasing means further comprising a fin extending towards the top of said first sheet from said first common base and being integrally connected with said first common base and attached to said first sheet, said fin causing the first protrusion of said first releasing means to pivot away from engaging with the third protrusion of said second releasing means to facilitate opening of the bag from outside thereof, said second releasing means having no portion thereof which overlies said first protrusion and which is contactable by said first protrusion as it pivots away from said third protrusion, and a weak point in said first common base located between said first and second protrusions defining a pivot point to further facilitate pivoting of said first protrusion away from said third protrusion upon the application of disengaging force from the outside of the bag.
Claim 3
Dependent Claim
348 words
A flexible bag, comprising: first and second sheets joined at the bottom and sides thereof, and releasably joined near the top thereof to form a closable bag opening; releasably closing means extending from near the tops of said first and second sheets and across said bag opening, comprising: first releasing means extending from said first sheet toward said second sheet and comprising first and second downwardly-opening, hook-like locking protrusions integrally connected to a first common base attached to said first sheet; second releasing means extending from said second sheet toward said first sheet and comprising third and fourth upwardly-opening, hook-like locking protrusions integrally connected to a second common base attached to a second sheet for releasably engaging with said first and second hook-like locking protrusions respectively; said first and second releasing means being positioned so that said third protrusion extends between said first and second protrusions and said second protrusion extends between said third and fourth protrusions; said first releasing means further comprising a fin extending towards the top of said first sheet from said first common base and being integrally connected with said first common base and attached to said first sheet, said fin causing the first protrusion of said first releasing means to pivot away from engaging with the third protrusion of said second releasing means to facilitate opening of the bag from outside thereof, said second releasing means having no portion thereof which overlies said first protrusion and which is contactable by said first protrusion of said first releasing means as it pivots away from said third protrusion and a weak point in said first common base located between said first and second protrusions defining a pivot point to further facilitate pivoting of said first protrusion away from said third protrusion upon the application of disengaging force from the outside of the bag; and a horizontal extension at the bottom of said first releasing means integral with said first common base, and extending inwardly from said first common base to underlie said fourth protrusion and inhibit its being released by force from inside said bag.
Claim 4
Dependent Claim
348 words
A flexible bag, comprising: first and second sheets joined at the bottom and sides thereof, and releasably joined near the top thereof to form a closable bag opening; releasably closing means extending from near the tops of said first and second sheets and across said bag opening, comprising: first releasing means extending from said first sheet toward said second sheet and comprising first and second downwardly-opening, hook-like locking protrusions integrally connected to a first common base attached to said first sheet; second releasing means extending from said second sheet toward said first sheet and comprising third and fourth upwardly-opening, hook-like locking protrusions integrally connected to a second common base attached to a second sheet for releasably engaging with said first and second hook-like locking protrusions respectively; said first and second releasing means being positioned so that said third protrusion extends between said first and second protrusions and said second protrusion extends between said third and fourth protrusions; said first releasing means further comprising a fin extending towards the top of said first sheet from said first common base and being integrally connected with said first common base and attached to said first sheet, said fin causing the first protrusion of said first releasing means to pivot away from engaging with the third protrusion of said second releasing means to facilitate opening of the bag from outside thereof, said second releasing means having no portion thereof which overlies said first protrusion and which is contactable by said first protrusion of said first releasing means as it pivots away from said third protrusion and a weak point in said first common base located between said first and second protrusions defining a pivot point to further facilitate pivoting of said first protrusion away from said third protrusion upon the application of disengaging force from the outside of the bag; and a horizontal extension at the bottom of said first releasing means integral with said first common base, and extending inwardly from said first common base to underlie said fourth protrusion and inhibit its being released by force from inside said bag.
Claim 5
Dependent Claim
256 words
A flexible bag, comprising: first and second sheets joined at the bottom and sides thereof, and releasably joined near the top thereof to form a closable bag opening; releasably closing means extending from near the tops of said first and second sheets and across said bag opening, comprising: first releasing means extending from said first sheet toward said second sheet and comprising first and second downwardly-opening, hook-like locking protrusions integrally connected to a first common base attached to said first sheet; second releasing means extending from said second sheet toward said first sheet and comprising third and fourth upwardly-opening, hook-like locking protrusions integrally connected to a second common base attached to said second sheet for releasably engaging with said first and second hook-like locking protrusions respectively; said first and second releasing means being positioned so that said third protrusion extends between said first and second protrusions and said second protrusion extends between said third and fourth protrusions; said first releasing means further comprising a fin extending towards the top of said first sheet from said first common base and being integrally connected with said first common base and attached to said first sheet, said fin causing the first protrusion of said first releasing means to pivot away from engaging with the third protrusion of said second releasing means to facilitate opening of the bag from outside thereof, said second releasing means having no portion thereof which overlies said first protrusion and which is contactable by said first protrusion as it pivots away from said third protrusion.
Claim 6
Dependent Claim
256 words
A flexible bag, comprising: first and second sheets joined at the bottom and sides thereof, and releasably joined near the top thereof to form a closable bag opening; releasably closing means extending from near the tops of said first and second sheets and across said bag opening, comprising: first releasing means extending from said first sheet toward said second sheet and comprising first and second downwardly-opening, hook-like locking protrusions integrally connected to a first common base attached to said first sheet; second releasing means extending from said second sheet toward said first sheet and comprising third and fourth upwardly-opening, hook-like locking protrusions integrally connected to a second common base attached to said second sheet for releasably engaging with said first and second hook-like locking protrusions respectively; said first and second releasing means being positioned so that said third protrusion extends between said first and second protrusions and said second protrusion extends between said third and fourth protrusions; said first releasing means further comprising a fin extending towards the top of said first sheet from said first common base and being integrally connected with said first common base and attached to said first sheet, said fin causing the first protrusion of said first releasing means to pivot away from engaging with the third protrusion of said second releasing means to facilitate opening of the bag from outside thereof, said second releasing means having no portion thereof which overlies said first protrusion and which is contactable by said first protrusion as it pivots away from said third protrusion.
Claim 7
Dependent Claim
34 words
A flexible bag as claimed in claim 3, wherein the fin of said first releasing means extends upwardly of said bag beyond the extent of the second common base of said second releasing means.
Claim 8
Dependent Claim
33 words
A flexible bag as in claim 1, wherein the fin of said first releasing means extends upwardly of said bag beyond the extent of the second common base of said second releasing means.
Claim 9
Dependent Claim
33 words
A flexible bag as in claim 2, wherein the fin of said first releasing means extends upwardly of said bag beyond the extent of the second common base of said second releasing means.
Claim 10
Dependent Claim
49 words
The flexible bag recited in claim 3 wherein said common bases and respective plurality of hook-like locking protrusions are extruded from molten thermoplastic and applied to a moving web of film so that said thermoplastic adheres to said moving web upon contact and thereafter cools to set said thermoplastic.
Claim 11
Dependent Claim
19 words
The flexible bag recited in claim 3, wherein said fin terminates below an upper open end of said bag.
References Cited (Backward Citations)
US28969A
Cited
NO97451A
Cited
US2978769A
Cited
USRE28969E
Cited
US3338284A
Cited
US3338285A
Cited
US3311144A
Cited
US3347298A
Cited
US3325084A
Cited
US3416585A
Cited
US3410327A
Cited
US3389783A
Cited
US3532571A
Cited
US3495306A
Cited
US3633642A
Cited
US3654049A
Cited
US3685562A
Cited
US3780781A
Cited
US3948705A
Cited
US3945403A
Cited
US4024010A
Cited
FR2332191A1
Cited
US4191230A
Cited
US4212337A
Cited
US4295919A
Cited
GB2037704A
Cited
US4354541A
Cited
US4279677A
Cited
US4392897A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-23 | 1989-06-24 | 1989-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-23 | 1993-06-24 | 1993-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-23 | 1997-06-24 | 1997-12-24 | $7700.00 | Window Closed / Lapsed |