US3616294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment of plastics with mineral acids containing hexavalent chromium and a petroleum fraction or neopentyl group containing acids and olefins
Assignee: Standard Oil Co
•
Filing: 1967-05-03
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Granted: 1971-10-26
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Expires: 1987-05-03
Abstract
Abstract In the art of treating plastic surfaces to improve the adhesion of paints or metals thereto wherein the surface is treated with a strong mineral acid solution containing hexavalent chromium, the adhesion is improved by adding to the acid solution from 0.1 to 6 percent by volume of a petroleum fraction boiling between 80* C. and 240* C. which is rich in branched chain aliphatic hydrocarbons and alicyclic hydrocarbons, olefins containing a neopentyl group, or carboxylic acids containing a neopentyl group.
Inventors
- 👤 Habet M Khelghatian
- 👤 James E Fitzpatrick
- 👤 James L Jezl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:18
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0054; B; B44; B44D; B44D3/00; B44D3/18; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/22; C23C18/24; C23C18/26; Y; Y10; Y10S; Y10S205/00; Y10S205/924; Y10S205/927
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
The process of claim 1 in which the plastic article is formed from a polyolefin, a vinyl aromatic polymer or a polyamide.
Claim 2
Dependent Claim
21 words
The process of claim 1 in which the plastic article is formed from a crystalline propylene polymer or copolymer with ethylene.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |