US3865626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester film of high strength and low electrical surface resistance
Assignee: Hoechst AG
•
Filing: 1973-09-18
•
Granted: 1975-02-11
•
Expires: 1993-09-18
Abstract
Abstract This invention relates to a polyester film of high strength and low surface resistance, and to a process for making such a film, the film carrying on at least one surface thereof a binder-free, firmly adhering layer of electroconductive particles.
Inventors
- 👤 Horst Diener
- 👤 Helga Lenhart
- 👤 Walter Seifried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:14
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/06; C08J7/043; C08J7/044; C08J7/046; H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; C08J2367/00; C08J2367/02; Y; Y10; Y10T; Y10T428/00; Y10T428/30; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
22 words
A STRETCHED POLYESTER FILM OF HIGH STRENGTH HAVING ON AT LEAST ONE SURFACE THEREOF A BINDER-FREE, FIRMLY ADHERING LAYER OF CARBON BLACK.
Claim 2
Dependent Claim
22 words
A STRETCHED POLYESTER FILM OF HIGH STRENGTH HAVING ON AT LEAST ONE SURFACE THEREOF A BINDER-FREE, FIRMLY ADHERING LAYER OF CARBON BLACK.
Claim 3
Dependent Claim
15 words
A film according to claim 1 having a surface resistance less than 106 Omega .
Claim 4
Dependent Claim
85 words
A process for making a polyester film of high strength and low surface resistance which comprises treating at least one surface of a stretched polyester film with a solvent or swelling agent capable of superficially dissolving or swelling the surface and selected from the group consisting of phenols, halogenated hydrocarbons, and halogenated lower fatty acids, applying carbon black to the treated surface, and subjecting the film to a temperature above the glass transition temperature Of the polyester for a period of at least one second.
Claim 5
Dependent Claim
85 words
A process for making a polyester film of high strength and low surface resistance which comprises treating at least one surface of a stretched polyester film with a solvent or swelling agent capable of superficially dissolving or swelling the surface and selected from the group consisting of phenols, halogenated hydrocarbons, and halogenated lower fatty acids, applying carbon black to the treated surface, and subjecting the film to a temperature above the glass transition temperature Of the polyester for a period of at least one second.
Claim 6
Dependent Claim
19 words
A process according to claim 3 in which the carbon black is dispersed in the solvent or swelling agent.
References Cited (Backward Citations)
US2788296A
Cited
US2817604A
Cited
US2817603A
Cited
US3022192A
Cited
US3058845A
Cited
US3118785A
Cited
US3357874A
Cited
US3823035A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |