US3780781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Openable bag
Assignee: Minigrip Inc
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Filing: 1971-09-07
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Granted: 1973-12-25
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Expires: 1991-09-07
Abstract
Abstract A plastic film structure for forming a bag including a sheet of thin plastic film with continuous shaped interlocking rib and groove profiles thereon either integral with the film or on strips which are fused to the film with the sheet having plastic reinforcing strips thereon between the profiles with the reinforcing strips providing tear guidelines for tearing off the top of a bag formed from the sheet to thereafter provide gripping flanges for separating the profiles and opening the bag.
Inventors
- 👤 T Uramoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:38
CPC Classifications
B; B65; B65D; B65D75/00; B65D75/52; B65D75/58; B65D75/5805; B29; B29C; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/47; B29C66/472; B29C66/4722; B29C66/474; B29C66/70; B29C66/72; B29C66/723; B65D33/00; B65D33/16; B65D33/25; B65D33/2508; B65D33/2516; B65D33/2533; B29C65/00; B29C65/02; B29C65/18; B29C65/22; B29C65/221; B29C65/222; B29C66/7232; B29C66/72327; B29C66/72328; B29C66/7234; Y; Y10; Y10S; Y10S383/00; Y10S383/908
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
69 words
A bag structure comprising, a bag body formed of a thin plastic film, said film being continuous at the bag top, facing mating interlocking profiles extending within the bag spaced downwardly from the top edge of the bag, a flat reinforcing strip means of plastic fused to the bag film along the top between the top edge and said profiles defining a top tear line spaced above said profiles.
Claim 2
Dependent Claim
69 words
A bag structure comprising, a bag body formed of a thin plastic film, said film being continuous at the bag top, facing mating interlocking profiles extending within the bag spaced downwardly from the top edge of the bag, a flat reinforcing strip means of plastic fused to the bag film along the top between the top edge and said profiles defining a top tear line spaced above said profiles.
Claim 3
Dependent Claim
23 words
A bag in accordance with claim 1 wherein said bag body has an opening at the bottom for filling and sealing the bag.
Claim 4
Dependent Claim
26 words
A bag in accordance with claim 1 wherein said profiles are carried by strips fused to the inner surface of the film of the bag body.
Claim 5
Dependent Claim
24 words
A bag structure constructed in accordance with claim 1 wherein the bag body has a seal along the top above said reinforcing strip means.
Claim 6
Dependent Claim
74 words
A bag structure comprising, a bag body formed of a flexible plastic film and having side walls, interlocking rib and groove elements on the inner surfaces of the side walls adjacent the top of the bag, flanges projecting above the rib and groove elements for gripping the bag and drawing the elements apart, and strips fused to the surfaces of the flanges above the elements for stiffening the flanges and providing improved gripping thereof.
Claim 7
Dependent Claim
74 words
A bag structure comprising, a bag body formed of a flexible plastic film and having side walls, interlocking rib and groove elements on the inner surfaces of the side walls adjacent the top of the bag, flanges projecting above the rib and groove elements for gripping the bag and drawing the elements apart, and strips fused to the surfaces of the flanges above the elements for stiffening the flanges and providing improved gripping thereof.
Claim 8
Dependent Claim
87 words
A reclosable bag comprising, a plastic film bag body being continuous at the top and closed by seals at the sides and bottom, and fastener strips fused to the inner surface of the bag adjacent the top with said strips having interlocking profiles on the inner face and a flat surface on the outer face with the flat surface being joined to the film, with said strip containing means for tearing open the top of the bag above the profiles along a line of weakened tear resistance.
Claim 9
Dependent Claim
87 words
A reclosable bag comprising, a plastic film bag body being continuous at the top and closed by seals at the sides and bottom, and fastener strips fused to the inner surface of the bag adjacent the top with said strips having interlocking profiles on the inner face and a flat surface on the outer face with the flat surface being joined to the film, with said strip containing means for tearing open the top of the bag above the profiles along a line of weakened tear resistance.
Claim 10
Dependent Claim
102 words
A reclosable bag structure comprising in combination, a bag body including opposing bag walls of a flexible material, opposed separate plastic fastener strips on the inner walls of the bag adjacent the bag top having mating pressure interlocking separable rib and groove elements projecting toward each other and having a base with a flat surface extending above and below the profiles with said base being joined to the inner surface of the bag wall, and the upper ends of the bag walls being joined to each other at the top of the bag to protect the bag contents above the fastener strips.
Claim 11
Dependent Claim
102 words
A reclosable bag structure comprising in combination, a bag body including opposing bag walls of a flexible material, opposed separate plastic fastener strips on the inner walls of the bag adjacent the bag top having mating pressure interlocking separable rib and groove elements projecting toward each other and having a base with a flat surface extending above and below the profiles with said base being joined to the inner surface of the bag wall, and the upper ends of the bag walls being joined to each other at the top of the bag to protect the bag contents above the fastener strips.
Claim 12
Dependent Claim
44 words
A reclosable bag structure constructed in accordance with claim 7 wherein said bag walls have an inner surface of plastic and are joined to the flat plastic base of the fastener strips by being fused thereto above and below said rib and groove elements.
Claim 13
Dependent Claim
52 words
A reclosable bag structure constructed in accordance with claim 7 wherein the side edges of the bag are joined by cross seals and the lower edges are joined by a bottom seal so that the bag provides a complete barrier protecting the bag contents from both above and below said fastener strips.
Claim 14
Dependent Claim
39 words
A reclosable bag structure constructed in accordance with claim 7 wherein the upper ends of the walls are joined by being continuous and integral with the material of the two walls folded at the extreme top of the bag.
Claim 15
Dependent Claim
27 words
A reclosable bag structure constructed in accordance with claim 7 wherein the opposing bag walls are of one piece and continuous at the top of the bag.
Claim 16
Dependent Claim
28 words
A reclosable bag structure constructed in accordance with claim 7 wherein the bag walls are joined at the bottom edge of the bag and are of one piece.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |