Patent US3775239A successfully refreshed from Google Patents.
US3775239A
Expired / Lapsed
US
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Packaging material, packages and method of making same
Assignee: Rap Ind Inc
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Filing: 1971-05-24
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Granted: 1973-11-27
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Expires: 1991-05-24
Abstract
Abstract This invention relates to a novel heat sealable packaging sheet material which is resistant to the transmission of oils and greases and to the strong durable packages made from such material.
Inventors
- 👤 J Snow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:34
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/10; B32B27/32; D; D21; D21H; D21H19/00; D21H19/80; D21H19/82; D21H19/824; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/536; B32B2323/00; B32B2323/04; B32B2398/00; B32B2398/20; B32B2439/00; B32B2439/70; Y; Y10; Y10S; Y10S206/00; Y10S206/819; Y10T; Y10T428/00; Y10T428/27; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
84 words
A packaging material according to claim 1 further characterized By being comprised of a hollow pouch-like container for enclosing an oil or grease containing product, said pouch-like container form having at least a front wall and a rear wall to enclose opposite sides of the product, the substrate surface of said packaging material being outermost, said envelope form being effected by joining together portions of said material with at least one heat welded longitudinal seam and at least one transverse heat welded end seam.
Claim 2
Independent Claim
93 words
A method of making a three layer flexible packaging sheet material characterized by strength, durability, heat sealability and oil resistance, comprising the steps of extruding onto at least one surface of paper substrate having a basis weight of at least 25 pounds per 3,000 square feet ream, a thin layer of thermoplastic ionomer resin in the amount of at least 6 pounds per 3,000 square feet, and a layer of polyethylene, said ionomer and polyethylene layers being immediately adjacent and extending substantially continuously over at least said one surface of said paper substrate.
Claim 3
Dependent Claim
84 words
A method of making a packaging material according to claim 3 by forming a hollow pouch-like container from the product of claim 1, said container having at least a front wall and a rear wall to enclose opposite sides of a product to be enclosed therein, the substrate surfaces of said packaging material being outermost on said container, said container being formed by joining together portions of the material into at least one heat-welded longitudinal seam and at least one transverse heat-welded end seam.
Claim 4
Dependent Claim
23 words
A method of making a material according to claim 3 further characterized in that the polyethylene is extruded between the ionomer and substrate.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |