US3607818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opaque polyester film
Assignee: EIDP Inc
•
Filing: 1968-07-23
•
Granted: 1971-09-21
•
Expires: 1988-07-23
Abstract
Abstract Polyester film suitable for support of photosensitive coatings rendered opaque by incorporation of carbon black and adherable by flame treatment.
Inventors
- 👤 Michael P Trubisky
- 👤 Darrell J Parish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:22
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/795; G03C1/7954; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
44 words
A substantially opaque molecularly oriented linear polyester film having incorporated therein about from 2-12 percent carbon black having a surface area of less than about 18 square meters per gram, substantially all of the particles of which are less than 10 microns in size.
Claim 2
Dependent Claim
44 words
A substantially opaque molecularly oriented linear polyester film having incorporated therein about from 2-12 percent carbon black having a surface area of less than about 18 square meters per gram, substantially all of the particles of which are less than 10 microns in size.
Claim 3
Dependent Claim
29 words
A polyester film of claim 1 having a contact angle with water of less than 75* and adherence of less than 2.0 as measured by the Gelatin Adhesion Test.
Claim 4
Dependent Claim
63 words
A polyester film of claim 1 having been exposed, for a period of about 0.0l-0.05 seconds, to a flame of a gaseous mixture consisting essentially of hydrocarbon fuel, oxygen, and nitrogen, the fuel being selected from parafinic and olefinic hydrocarbons, the fuel equivalent ratio being about from 0.8 to 1.3, the oxygen ratio of the gaseous mixture being about from 0.250 to 0.290.
Claim 5
Dependent Claim
16 words
A polyester film of claim 1 wherein the polyester comprises at least 85 percent polyethylene terephthalate.
Claim 6
Dependent Claim
20 words
A polyester film of claim 4 wherein the polyester further comprises about from 2 to 5 percent diethylene glycol copolymer.
Claim 7
Dependent Claim
23 words
A film of claim 1 wherein the carbon black has a surface area of about from 12 to 18 square meters per gram.
Claim 8
Dependent Claim
14 words
A polyester film of claim 1 wherein the carbon black consists essentially of lampblack.
Claim 9
Dependent Claim
24 words
A polyester film of claim 1 wherein the surface area of the carbon black is about from 12 to 15 square meters per gram.
Claim 10
Dependent Claim
14 words
A polyester film of claim 1 further comprising about from 0.5-5 percent polyethylene oxide.
Claim 11
Dependent Claim
91 words
A molecularly oriented polyester film consisting of at least 85 percent of polyethylene terephthalate and about 2-12 percent lampblack having an average particle size of less than about 3 microns and surface area of about from 12 to 15 square meters per gram, further comprising about from 0.5-5 percent polyethylene oxide, the film having been subjected to a flame of a hydrocarbon mixture having a fuel equivalent ratio of about 1.2 and an oxygen ratio of about from 0.250 to 0.290 for a period of about from 0.01 to 0.05 seconds.
Claim 12
Dependent Claim
91 words
A molecularly oriented polyester film consisting of at least 85 percent of polyethylene terephthalate and about 2-12 percent lampblack having an average particle size of less than about 3 microns and surface area of about from 12 to 15 square meters per gram, further comprising about from 0.5-5 percent polyethylene oxide, the film having been subjected to a flame of a hydrocarbon mixture having a fuel equivalent ratio of about 1.2 and an oxygen ratio of about from 0.250 to 0.290 for a period of about from 0.01 to 0.05 seconds.
Claim 13
Dependent Claim
11 words
A polyester film of claim 10 coated with a photosensitive emulsion.
Claim 14
Dependent Claim
15 words
A polyester film of claim 11 wherein the emulsion is a gelatino silver chloride emulsion.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |