US3740258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resinous enclosure members rendered impermeable by sulfonation
Assignee: Dow Chemical Co
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Filing: 1971-04-12
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Granted: 1973-06-19
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Expires: 1991-04-12
Abstract
Abstract RESINOUS ENCLOSURE MEMBERS SURFACE SULFONATED TO A DEGREE SUCH THAT FROM ABOUT 0.015 TO ABOUT 50.0 MILLIGRAMS OF SULFUR TRIOXIDE EQUIVALENTS RESIDE ON A SQUARE CENTIMETER OF SURFACE THEREOF EFFECTIVELY CONTAIN HYDROCARBONS AND OTHER ORGANIC MATERIALS. THE SULFONATED ENCLOSURE MEMBERS ARE RENDERED SUBSTANTIALLY IMPERVIOUS TO THE PENETRATION OF VARIOUS SOLVENTS AND VAPORS BY THIS DEGREE OF SURFACE SULFONATION. AS A RESULT OF SUCH TREATMENT, THESE ENCLOSURE MEMBERS ARE USEFUL TO HOLD, RETAIN, OR TRANSPORT HYDROCARBON SOLVENTS, PERFUMES, FUELS, ETC., AND THUS CAN BE USED AS GASOLINE TANKS, PERFUME BOTTLES, PLASTIC HOSES, INDUSTRIAL CONTAINERS, AND THE LIKE.
Inventors
- 👤 Wilhelm E Walles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:57
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/14; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/31504; Y10T428/31855
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |