US4214034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Agricultural covering multilayer film or sheet structure and method for thermal insulation
Assignee: Sekisui Chemical Co Ltd
•
Filing: 1978-06-01
•
Granted: 1980-07-22
•
Expires: 1998-06-01
Abstract
Abstract A covering multilayer film or sheet structure for agricultural application, which consists essentially of: (1) a film or sheet of a resin composition comprising (A) 100 parts by weight of a thermoplastic resin selected from the group consisting of olefinic resins and vinyl chloride resins and (B) about 1 to about 40 parts by weight of an acetal resin, and (2) a layer of the thermoplastic resin (A) laminated to at least one surface of the film or sheet (1); and a method for maintaining an agricultural locus at temperatures suitable for the growth of plants, using aforesaid covering multilayer film or sheet.
Inventors
- 👤 Yoshiaki Kodera
- 👤 Kiyoyuki Watanabe
- 👤 Tetsuo Kadoya
- 👤 Tadashi Taguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:17
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/42; B32B5/00; B32B5/22; B32B5/32; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249991; Y10T428/249992; Y10T428/249993; Y10T428/31504; Y10T428/31855; Y10T428/31859; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928; Y10T428/31935; Y10T428/31942
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
117 words
A covering multilayer film or sheet structure for agricultural application, which consists essentially of: (1) a film or sheet of a resin composition comprising (A) 100 parts by weight of a thermoplastic resin selected from the group consisting of polyethylene, ethylene/vinyl acetate copolymer, mixtures thereof, and vinyl chloride resins and (B) about 1 to about 40 parts by weight of an acetal resin having a degree of polymerization of about 500 to about 3,500 and selected from the group consisting of polyoxymethylene polymer and polyoxymethylene copolymer containing up to about 3% by weight of a comonomer, and (2) a layer of the thermoplastic resin (A) laminated to at least one surface of the film or sheet (1).
Claim 2
Dependent Claim
117 words
A covering multilayer film or sheet structure for agricultural application, which consists essentially of: (1) a film or sheet of a resin composition comprising (A) 100 parts by weight of a thermoplastic resin selected from the group consisting of polyethylene, ethylene/vinyl acetate copolymer, mixtures thereof, and vinyl chloride resins and (B) about 1 to about 40 parts by weight of an acetal resin having a degree of polymerization of about 500 to about 3,500 and selected from the group consisting of polyoxymethylene polymer and polyoxymethylene copolymer containing up to about 3% by weight of a comonomer, and (2) a layer of the thermoplastic resin (A) laminated to at least one surface of the film or sheet (1).
Claim 3
Dependent Claim
15 words
The covering multilayer film of claim 1, wherein the ethylene resin is low density polyethylene.
Claim 4
Dependent Claim
24 words
The covering multilayer film of claim 1, wherein the thermoplastic resin is ethylene/vinyl acetate copolymer having a vinyl acetate content of 5 to 20%.
Claim 5
Dependent Claim
31 words
The covering multilayer film or sheet structure of claim 1 wherein at least one of the film or sheet (1) and the resin (A) layer (2) is in the foamed state.
References Cited (Backward Citations)
CA731239A
Cited
GB1006226A
Cited
US3250823A
Cited
US3306877A
Cited
GB1014016A
Cited
US3635876A
Cited
US3476832A
Cited
JPS479260U
Cited
US3980734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-22 | 1984-01-21 | 1984-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-22 | 1988-01-21 | 1988-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-22 | 1992-01-21 | 1992-07-22 | $7700.00 | Window Closed / Lapsed |