Patent DE2814401A1 successfully refreshed from Google Patents.
US3317330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating polyethylene and polypropylene plastic surfaces
Assignee: Chemclean Products Corp
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Filing: 1965-01-05
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Granted: 1967-05-02
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Expires: 1985-01-05
Abstract
No abstract record available.
Inventors
- 👤 Livingston Sidney
- 👤 Mackles Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:08
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/14; D; D06; D06P; D06P3/00; D06P3/79; C08J2323/00; C08J2323/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
41 words
A SOLUTION FOR RENDERING THE NORMALLY HYDROPHOBIC SURFACES OF POLYETHYLENE AND POLYPROPYLENE ARTICLES HYDROPHYLIC, SAID SOLUTION COMPRISING, BY EIGHT, 8.00% WATER, 2.00% CHROMIC ACID, AND POTASSIUM PERMANGANATE, CONCENTRATED SULPHURIC ACID AND A WETTING AGENT, WHOSE AMOUNTS MAY VARY AS FOLLOWS, RESPECTIVELY;
References Cited (Backward Citations)
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US3188258A
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US2979422A
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US3222191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-01 | 1970-10-31 | 1971-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-01 | 1974-10-31 | 1975-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-01 | 1978-10-31 | 1979-05-02 | $7700.00 | Window Closed / Lapsed |