US4840823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic film packaging material
Assignee: NITTETSU KOUGYO KK
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Filing: 1987-10-09
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Granted: 1989-06-20
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Expires: 2007-10-09
Abstract
Abstract The present invention provides a plastic film packaging material comprising 100 weight parts of a polyethylene resin and 5 to 100 weight parts of an additive comprising a silica containing naturally porous material which is hydrophillic and which has a pore diameter of 15-200A, a specific surface area of 110 to 130 m2/g, voids of 40 to 50% and a specific gravity of about 1.2.
Inventors
- 👤 Makoto Chigami
- 👤 Sumio Ogihara
- 👤 Hiroshi Hoaki
- 👤 Tomonobu Kondo
- 👤 Masao Okamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:21
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; B; B65; B65D; B65D81/00; B65D81/24; C08K7/00; C08K7/22; C08K7/24; C08K7/26; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1345; Y10T428/25; Y10T428/259; Y10T428/26; Y10T428/268; Y10T428/269; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31938
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
64 words
A plastic film packaging material comprising 100 weight parts of a polyethylene resin and, 5 to 100 weight parts of an additive comprising a silica containing naturally porous material which is hydrophillic and which has a pore diameter of 15-200 A, a specific surface area of 110 to 130 m 2 /g, voids of 40 to 50% and a specific gravity of about 1.2
Claim 2
Dependent Claim
64 words
A plastic film packaging material comprising 100 weight parts of a polyethylene resin and, 5 to 100 weight parts of an additive comprising a silica containing naturally porous material which is hydrophillic and which has a pore diameter of 15-200 A, a specific surface area of 110 to 130 m 2 /g, voids of 40 to 50% and a specific gravity of about 1.2
Claim 3
Dependent Claim
29 words
A plastic film packaging material according to claim 1 wherein the additive is employed in the amount of 10-100 weight parts based on 100 weight parts of polyethylene resin.
Claim 4
Dependent Claim
18 words
A plastic film packaging material according to claim 1 wherein said polyethylene resin is a low density polyethylene.
Claim 5
Dependent Claim
19 words
A plastic film packaging material according to claim 1 wherein said polyethylene resin is an ethylene ethyl acrylate copolymer.
Claim 6
Dependent Claim
19 words
A plastic film packaging material according to claim 1 wherein said polyethylene resin is an ethylene vinyl acetate copolymer.
Claim 7
Dependent Claim
21 words
A plastic film packaging material according to claim 1 wherein said polyethylene resin is a vapor phase linear low density polyethylene.
Claim 8
Dependent Claim
21 words
A plastic film packaging material according to claim 1 wherein said polyethylene resin is a vapor phase ultra low density polyethylene.
Claim 9
Dependent Claim
12 words
A packaging bag formed from the film packaging material of claim 1.
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) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |