Patent US4024010A successfully refreshed from Google Patents.
US4024010A
Expired / Lapsed
US
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Open profile bag
Assignee: Minigrip Inc
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Filing: 1975-05-15
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Granted: 1977-05-17
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Expires: 1995-05-15
Abstract
Abstract A method and mechanism for preparing individual reclosable thin plastic bags with rib and groove profiles delivered in unengaged position on the finished bag, whereby said bags are made from a continuous supply of layers of film having critically shaped small rib and groove profiles on facing surfaces thereof interlocked with each other and continuously advancing the layers of film and inserting a fixed separating finger between the rib and groove profiles so as to draw them apart, maintaining the profiles in alignment by grooves which do not press the profiles flat but carefully guide them laterally, guiding the film profile layers toward each other and then immediately pressing the profile layers together with a sealing and cutting means following the finger, so that the profiles are interlocked at the location of sealing only.
Inventors
- 👤 Salvatore Boccia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:18
CPC Classifications
B; B65; B65D; B65D33/00; B65D33/16; B65D33/25; B65D33/2508; B29; B29C; B29C65/00; B29C65/02; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/346; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/4312; B29C66/432; B29C66/4322; B65D33/2541; A; A44; A44B; A44B19/00; A44B19/10; A44B19/16; B29C65/74; B29C65/743; B31; B31B; B31B70/00; B31B70/74; B31B70/81; B31B70/813; B31B70/8131; Y; Y10; Y10S; Y10S493/00; Y10S493/916; Y10S493/927; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1054; Y10T156/12; Y10T156/1313
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
131 words
A method of preparing bags of thin plastic film having continuous reclosable fasteners comprising the steps: continuously advancing facing layers of plastic bag film having facing interlocked rib and groove profiles on the inner surface adjacent one edge of the layers; positioning a separating finger between the rib and groove profiles along the path traveled by the layers so that the profiles are separated; holding said rib and groove elements in exact opposing alignment while traveling over the separating finger; and immediately after the separating finger intermittently pressing the layers together transversely of their length at intervals determined by the width of the bags desired by pressing together sealing bars at a sealing location to press the profiles together into interlocking engagement and applying heat to form cross-seams on the layers.
Claim 2
Independent Claim
131 words
A method of preparing bags of thin plastic film having continuous reclosable fasteners comprising the steps: continuously advancing facing layers of plastic bag film having facing interlocked rib and groove profiles on the inner surface adjacent one edge of the layers; positioning a separating finger between the rib and groove profiles along the path traveled by the layers so that the profiles are separated; holding said rib and groove elements in exact opposing alignment while traveling over the separating finger; and immediately after the separating finger intermittently pressing the layers together transversely of their length at intervals determined by the width of the bags desired by pressing together sealing bars at a sealing location to press the profiles together into interlocking engagement and applying heat to form cross-seams on the layers.
Claim 3
Dependent Claim
40 words
A method of preparing bags of thin plastic film having continuous reclosable fasteners in accordance with the steps of claim 1: including applying the pressing step at a location no greater than 1/2 from the location of said separating finger.
Claim 4
Dependent Claim
45 words
A method of preparing bags of thin plastic film having continuous reclosable fasteners in accordance with the steps of claim 1: including supporting the layers after separation by forces against the film laterally of the profiles without engagement with the facing portions of the profiles.
Claim 5
Dependent Claim
44 words
A method of preparing bags of thin plastic film having continuous reclosable fasteners in accordance with the steps of claim 1: including the step of bringing the layers toward each other into touching engagement immediately prior to said step of pressing the layers together.
Claim 6
Dependent Claim
49 words
A method of preparing bags of thin plastic film having continuous reclosable fasteners in accordance with the steps of claim 1: including maintaining a longitudinal tension on the layers during all of the steps of the method by applying a pulling force drawing the layers over the separating finger.
Claim 7
Dependent Claim
43 words
A method of preparing bags of thin plastic film having continuous reclosable fasteners in accordance with the steps of claim 1: including the step of simultaneously cutting the layers at the time of said applying heat and at the location of the cross-seams.
References Cited (Backward Citations)
US3202559A
Cited
US3340116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |