US2884339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for minimizing the formation of craters in surface coatings
Assignee: Shell Development Co
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Filing: 1957-02-15
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Granted: 1959-04-28
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Expires: 1977-02-15
Abstract
No abstract record available.
Inventors
- 👤 Dannenberg Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:45
CPC Classifications
C; C09; C09D; C09D163/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
92 words
A PROCESS FOR MINIMIZING THE FORMATION OF CRATERS IN SURFACE COATINGS PREPARED FROM POLYEPOXIDES HAVING AN EPOXY EQUIVALENCY GREATER THAN 1.0 WHICH COMPRISES APPLYING TO THE SURFACE OF THE METAL SUBSTRATA PRIOR TO APPLICATION OF THE POLYEPOXIDE A LAYER 30 TO 60 MOLECULES THICK OF A POLYMER HAVING A MAIN HYDROCARBON CHAIN TO WHICH IS ATTACHED (1) A PLURALITY OF LONG ALKYL SIDE CHAINS CONTAINING FROM 16 TO 32 CARBON ATOMS ATOMS AND (2) A PLURALITY OF POLAR GROUPS SELECTED FROM THE GROUP CONSISTING OF HYDROXYL GROUP, CARBOXYL GROUP AND ESTER GROUPS.
References Cited (Backward Citations)
US2602785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-27 | 1962-10-27 | 1963-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-27 | 1966-10-27 | 1967-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-27 | 1970-10-27 | 1971-04-28 | $7700.00 | Window Closed / Lapsed |