US4158412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tear out opening device
Assignee: WestRock Minnesota Corp
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Filing: 1978-06-26
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Granted: 1979-06-19
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Expires: 1998-06-26
Abstract
Abstract A tear out opening member or flap for use with paperboard cartons and the like comprises a paperboard substrate having an upper surface and an opposed lower or undersurface. The substrate includes a first cut portion disposed on the upper substrate surface and penetrating the upper surface to a point intermediate the thickness of the substrate. A second cut portion is disposed on the undersurface of the substrate, the second cut being spaced apart from the first cut and enveloping the first cut. Alternatively the disposition of first and second cuts may be reversed such that the first cut envelopes the second cut. The second cut penetrates the undersurface to a point intermediate the thickness of the substrate. Spaced apart reinforcement hinge members are disposed along the second cut at a predetermined angle thereto.
Inventors
- 👤 Lawrence Wysocki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:31
CPC Classifications
B; B65; B65D; B65D5/00; B65D5/42; B65D5/54; B65D5/5405; B65D5/542; Y; Y10; Y10S; Y10S229/00; Y10S229/924; Y10S229/926
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
148 words
A paperboard carton made of a paperboard substrate including an outer, upper layer having a protective polyethylene coating, an inner, lower layer of uncoated paperboard stock, and an intermediate core layer including plies of thin, newsback board, said carton having a tear-out access member defined by a first cut portion generally oval in configuration disposed on said upper substrate surface and penetrating said upper layer to a point intermediate the thickness of the core layer, a second cut portion generally oval in configuration disposed on said under substrate surface, said second cut portion being spaced apart from the first cut portion and substantially enveloping said first cut portion, said second cut portion penetrating said lower layer to a point intermediate the thickness of the core layer; and spaced apart reinforcing means disposed on said substrate undersurface within said second cut at a predetermined angle to said second cut.
Claim 2
Dependent Claim
148 words
A paperboard carton made of a paperboard substrate including an outer, upper layer having a protective polyethylene coating, an inner, lower layer of uncoated paperboard stock, and an intermediate core layer including plies of thin, newsback board, said carton having a tear-out access member defined by a first cut portion generally oval in configuration disposed on said upper substrate surface and penetrating said upper layer to a point intermediate the thickness of the core layer, a second cut portion generally oval in configuration disposed on said under substrate surface, said second cut portion being spaced apart from the first cut portion and substantially enveloping said first cut portion, said second cut portion penetrating said lower layer to a point intermediate the thickness of the core layer; and spaced apart reinforcing means disposed on said substrate undersurface within said second cut at a predetermined angle to said second cut.
Claim 3
Dependent Claim
29 words
A tear out access member as recited in claim 1 in which said spaced apart reinforcement means are disposed at an angle of 90° to said second cut portion.
Claim 4
Dependent Claim
30 words
A tear out access member as recited in claim 1 in which each said spaced apart reinforcement means is disposed at an angle of 45° to said second cut portion.
Claim 5
Dependent Claim
26 words
A tear out access member as recited in claim 1 in which said first cut portion is spaced from said second cut portion approximately 1/32 inches.
Claim 6
Dependent Claim
26 words
A tear out access member as recited in claim 1 in which said first cut portion is spaced from said second cut portion approximately 1/16 inches.
Claim 7
Dependent Claim
26 words
A tear out access member as recited in claim 1 in which said reinforcement means have a thickness approximately equal to that of the paperboard substrate.
Claim 8
Dependent Claim
39 words
A tear out access member as recited in claim 1 which further includes second spaced apart reinforcement means disposed on said upper substrate surface and within said first cut portion at a predetermined angle to said first cut portion.
Claim 9
Dependent Claim
30 words
A tear out access member as recited in claim 7 in which the second spaced apart reinforcement means are disposed at an angle of 90° to said first cut portion.
Claim 10
Dependent Claim
31 words
A tear out access member as recited in claim 7 in which each said second spaced apart reinforcement means is disposed at an angle of 45° to said first cut portion.
References Cited (Backward Citations)
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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) | 1982-06-18 | 1982-12-18 | 1983-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-18 | 1986-12-18 | 1987-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-18 | 1990-12-18 | 1991-06-19 | $7700.00 | Window Closed / Lapsed |