US4104438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-barrier coated films, sheets or foils and method of preparation
Assignee: EIDP Inc
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Filing: 1975-11-12
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Granted: 1978-08-01
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Expires: 1995-11-12
Abstract
Abstract Films, sheets or foils are given a gas-barrier coating of an aromatic polyamide, polyimide, polyamide-imide, polyhydrazide, polyamide-hydrazide, or polyazomethine by direct vapor-phase condensation polymerization of their respective monomers. The monomers are introduced in an inert diluent gas, mixed and reacted in the presence of the surface to be coated. The surface is maintained above the critical minimum deposition temperature of the monomers but below about 300° C. The coating is formed to a thickness between about 0.1 and 0.6 mil.
Inventors
- 👤 Rudolph John Angelo
- 👤 Richard Nelson Blomberg
- 👤 Fritz Peter Boettcher
- 👤 Richard Masayoshi Ikeda
- 👤 Michael Robert Samuels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:57
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/60; C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/06; C08G12/08; C08G69/00; C08G69/02; C08G69/26; C08G69/32; C08G73/00; C08G73/06; C08G73/08; C08G73/10; C08G73/1003; C08G73/1007; C08G73/1028; C08G73/1067; C08G73/14; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/048; C08J2477/00; C08J2479/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10S428/911; Y10S428/913; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31721; Y10T428/31725; Y10T428/31728; Y10T428/31736
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
43 words
An organic polymeric film having a gas-barrier coating thereon of an aromatic polyamide consisting essentially of units p-phenylene diamine and terephthalic acid having a density greater than about 1.42, a planar X-ray orientation and an electron microscope morphology of a coalesced particulate texture.
Claim 2
Dependent Claim
43 words
An organic polymeric film having a gas-barrier coating thereon of an aromatic polyamide consisting essentially of units p-phenylene diamine and terephthalic acid having a density greater than about 1.42, a planar X-ray orientation and an electron microscope morphology of a coalesced particulate texture.
Claim 3
Dependent Claim
23 words
The film as defined in claim 1 wherein the polymeric film is a polyimide film or a biaxially oriented, heat-set polyethylene terephthalate film.
Claim 4
Dependent Claim
41 words
A substrate having a coating thereon of an aromatic polyamide consisting essentially of units of p-phenylene diamine and terephthalic acid having a density greater than about 1.42, a planar X-ray orientation and an electron microscope morphology of a coalesced particulate texture.
Claim 5
Dependent Claim
41 words
A substrate having a coating thereon of an aromatic polyamide consisting essentially of units of p-phenylene diamine and terephthalic acid having a density greater than about 1.42, a planar X-ray orientation and an electron microscope morphology of a coalesced particulate texture.
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) | 1981-07-31 | 1982-01-30 | 1982-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-31 | 1986-01-30 | 1986-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-31 | 1990-01-30 | 1990-08-01 | $7700.00 | Window Closed / Lapsed |