Patent US2369507A successfully refreshed from Google Patents.
US4139119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sift proof carton
Assignee: WestRock Minnesota Corp
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Filing: 1978-01-30
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Granted: 1979-02-13
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Expires: 1998-01-30
Abstract
Abstract A paperboard carton is provided with an upper and lower continuous thermoplastic liner adhesively connected in spaced relation to the walls of the carton to form with the walls, a pouch for the contents of the carton. The pouch eliminates the need of a separate foil, glassine, plastic or like receptacle within the interior of the carton to preclude the contents from sifting through the walls and to provide an effective seal once the carton is opened, so as to maintain the carton contents, such as food, fresh.
Inventors
- 👤 Edwin C. McLaren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:28
CPC Classifications
B; B65; B65D; B65D5/00; B65D5/42; B65D5/56; B65D5/60; B65D5/603; Y; Y10; Y10S; Y10S229/00; Y10S229/941
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
193 words
A sift proof carton comprising: a front wall, a rear wall, and opposed side walls connected to said front and rear walls, a top wall connected to said side walls, a bottom wall connected to said side walls, an upper liner member adhesively connected intermediate its top edge and bottom edge to the front, rear and side walls of the carton such that the top and bottom edges of said upper liner member are free from said carton, the bottom edge of said upper liner member being movable towards the inner portion of the carton to inhibit shifting of material contained in the carton, a lower liner member adhesively connected intermediate its top edge and bottom edge to the front, rear and side walls of the carton such that the top and bottom edges of said lower liner member are free from said carton, the top edge of said lower liner member being movable towards the interior portion of the carton to inhibit shifting of material contained in the carton, the lower edge of said lower liner member being sealed together, and the upper edge of said upper liner members being sealed together.
Claim 2
Dependent Claim
193 words
A sift proof carton comprising: a front wall, a rear wall, and opposed side walls connected to said front and rear walls, a top wall connected to said side walls, a bottom wall connected to said side walls, an upper liner member adhesively connected intermediate its top edge and bottom edge to the front, rear and side walls of the carton such that the top and bottom edges of said upper liner member are free from said carton, the bottom edge of said upper liner member being movable towards the inner portion of the carton to inhibit shifting of material contained in the carton, a lower liner member adhesively connected intermediate its top edge and bottom edge to the front, rear and side walls of the carton such that the top and bottom edges of said lower liner member are free from said carton, the top edge of said lower liner member being movable towards the interior portion of the carton to inhibit shifting of material contained in the carton, the lower edge of said lower liner member being sealed together, and the upper edge of said upper liner members being sealed together.
Claim 3
Dependent Claim
14 words
The carton of claim 7 wherein said strip liners are formed from flexible thermoplastic.
Claim 4
Dependent Claim
14 words
The carton of claim 1 wherein said strip liners are formed from flexible foil.
Claim 5
Dependent Claim
12 words
The carton of claim 1 wherein said carton is formed from paperboard.
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) | 1982-02-12 | 1982-08-14 | 1983-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-12 | 1986-08-14 | 1987-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-12 | 1990-08-14 | 1991-02-13 | $7700.00 | Window Closed / Lapsed |