US3595468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opening device
Assignee: Dow Chemical Co
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Filing: 1969-06-06
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Granted: 1971-07-27
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Expires: 1989-06-06
Abstract
Abstract An improved opening device is disclosed comprising a strip of material, preferably fibrous material such as paper, secured flatwise between opposite face portions of an item such as a film pouch. The face portions terminate in edges, i.e., the top edges of the pouch, which can be grasped as tabs to open the item by separating the face portions at the region of the strip. Separation can be at the interface of the strip and either face portion, or the strip can delaminate into layers associated with the face portions, respectively. Such, an opening device, even if formed of paper, is useable in certain ''''boil-in-the-bag''''-type packages.
Inventors
- 👤 John P Repko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:29
CPC Classifications
B; B65; B65D; B65D75/00; B65D75/52; B65D75/58; B65D75/66; B65D75/68; B65D33/00; B65D33/16; B65D33/18; B65D33/22
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
115 words
A convenient opening device for an item having oppositely disposed face portions and openable by separating said face portions, said opening device comprising a strip of material sandwiched between and secured together with said face portions, respectively, said strip comprising a laminate of intimately joined layers of thermoplastic material including at least a layer of vinylidene chloride copolymer, and immediately adjacent thereto, a layer of ethylene vinyl acetate copolymer, said strip defining a region of preferential separation formed by applying heat to said strip, means associated with at least one of said face portions to permit a separating force to be applied to said strip to open said item along said region of preferential separation.
Claim 2
Dependent Claim
115 words
A convenient opening device for an item having oppositely disposed face portions and openable by separating said face portions, said opening device comprising a strip of material sandwiched between and secured together with said face portions, respectively, said strip comprising a laminate of intimately joined layers of thermoplastic material including at least a layer of vinylidene chloride copolymer, and immediately adjacent thereto, a layer of ethylene vinyl acetate copolymer, said strip defining a region of preferential separation formed by applying heat to said strip, means associated with at least one of said face portions to permit a separating force to be applied to said strip to open said item along said region of preferential separation.
Claim 3
Dependent Claim
22 words
The opening device of claim 1 wherein said strip comprises a laminate of polyethylene/ethylene vinyl acetate copolymer/vinylidene chloride copolymer/ethylene vinyl acetate copolymer/polyethylene.
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |