Patent US2800136A successfully refreshed from Google Patents.
US4147291A
Expired / Lapsed
US
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Packing bag for light-sensitive material
Assignee: Fujifilm Holdings Corp
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Filing: 1977-04-07
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Granted: 1979-04-03
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Expires: 1997-04-07
Abstract
Abstract A packing bag, particularly suitable for use for light-sensitive materials, composed of a composite laminate which comprises a cross laminate film of two uniaxially stretched high density polyethylene films wherein the stretching directions of the two films cross each other at an angle of about 45° to about 90° C. and a low density polyethylene film containing a light-intercepting agent and an antistatic agent, wherein the bag is so constructed that the low density polyethylene film surface of the laminate film is the interior surface of the packing bag.
Inventors
- 👤 Matsuo Akao
- 👤 Taichi Kurechi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:18
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/03; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/20; B32B27/32; B32B3/00; B32B3/02; B32B3/04; B32B7/02; B65; B65D; B65D75/00; B65D75/26; B32B2307/00; B32B2307/20; B32B2307/21; B32B2307/50; B32B2307/514; B32B2307/516; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/046; B32B2439/00; B32B2439/40; B32B2439/46; Y; Y10; Y10S; Y10S383/00; Y10S383/908; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
72 words
A packing bag for light-sensitive materials which comprises a cross laminate film of two uniaxially stretched high density polyethylene films wherein the stretching directions of the two films cross each other at an angle of about 45° to about 90° and a low density polyethylene film containing a light-intercepting agent and an antistatic agent, wherein for low density polyethylene film surface of said cross laminate is the interior surface of said bag.
Claim 2
Dependent Claim
72 words
A packing bag for light-sensitive materials which comprises a cross laminate film of two uniaxially stretched high density polyethylene films wherein the stretching directions of the two films cross each other at an angle of about 45° to about 90° and a low density polyethylene film containing a light-intercepting agent and an antistatic agent, wherein for low density polyethylene film surface of said cross laminate is the interior surface of said bag.
Claim 3
Dependent Claim
39 words
The packing bag of claim 1 including at least one additional layer selected from the group consisting of a layer of a low density polyethylene film cloth, paper, cellophane, a synthetic resin sheet, a flat yarn and aluminum foil.
Claim 4
Dependent Claim
13 words
The packing bag of claim 1 wherein an adhesive is used for lamination.
Claim 5
Dependent Claim
19 words
The packing bag of claim 1 wherein the high density polyethylene films are heat-sealed to one another for lamination.
Claim 6
Dependent Claim
17 words
The packing bag of claim 1, wherein the light-intercepting agent and the antistatic agent is carbon black.
Claim 7
Dependent Claim
28 words
The packing bag of claim 5 wherein the carbon black is present in an amount of up to about 12% by weight of the low density polyethylene film.
Claim 8
Dependent Claim
29 words
The packing bag of claim 6 wherein the carbon black is present in an amount of about 2.5% to about 12% by weight of the low density polyethylene film.
Claim 9
Dependent Claim
35 words
The packing bag of claim 1, additionally including an intermediate layer which has superior heat stability than said uniaxially stretched high density polyethylene films and is capable of bonding to both of said polyethylene films.
Claim 10
Dependent Claim
15 words
The packing bag of claim 8, wherein the intermediate layer is an aluminum foil layer.
Claim 11
Dependent Claim
27 words
The packing bag of claim 1 wherein the uniaxially stretched high density polyethylene films have been stretched at a stretching ratio of about 2 to 6 times.
Claim 12
Dependent Claim
15 words
The packing bag of claim 10 wherein the stretching ratio is 3 to 4 times.
Claim 13
Dependent Claim
16 words
The packing bag of claim 1 wherein the light-intercepting agent is carbon black or a pigment.
Claim 14
Dependent Claim
21 words
The packing bag of claim 12 wherein the pigment is TiO 2 , clay, CaCO 3 , SiO 2 or talc.
Claim 15
Dependent Claim
16 words
The packing bag of claim 1 wherein the low density polyethylene film contains a synthetic resin.
Claim 16
Dependent Claim
19 words
The packing bag of claim 14 wherein the synthetic resin is polybutene, polyisobutylene, polyisoprene, styrenebutadiene copolymer or nitrile rubber.
Claim 17
Dependent Claim
22 words
The packing bag of claim 1, wherein the high density polyethylene film has a density of about 0.94 g/cm 3 or higher.
Claim 18
Dependent Claim
31 words
The packing bag of claim 16 wherein the high density polyethylene has a melting point from about 120° to 140° C. and a degree of crystallization of about 75% or higher.
Claim 19
Dependent Claim
21 words
The packing bag of claim 1 wherein the low density polyethylene has a density from about 0.91 to about 0.92 g/cc.
Claim 20
Dependent Claim
31 words
The packing bag of claim 18 wherein the low density polyethylene has a melting point from about 110° to 112° C. and a degree of crystallization of about 65% or less.
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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) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |