US3772228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyepoxide dispersion coating compositions
Assignee: Shell USA Inc
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Filing: 1971-01-07
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Granted: 1973-11-13
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Expires: 1991-01-07
Abstract
Abstract A ONE-PACKAGE, THERMOSET COATING COMPOSITION THAT CAN BE APPLIED BY CONVENTIONAL LIQUID APPLICATION TECHNIQUES IS PREPARED BY GRINDING AND DISPERSING (1) A SOLID, FRIABLE POLYEPOXIDE, (2) A SOLID, FRIABLE EPOXY CURING AGENT, PREFERABLY POLYCARBOXYLIC ACID ANHYDRIDES SUCH AS BENZOPHENONE TETRACARBOXYLIC DIANHYDRIDE AND, OPTIONALLY (3) AN EPOXY CURING ACCELERATOR (STANNOUS OCTOATE), IN A LIQUID WHICH IS A NON-SOLVENT FOR THE COMPONENTS (ALIPHATIC HYDROCARBONS).
Inventors
- 👤 R Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:03
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4223; C09; C09D; C09D163/00
Claims Analysis
Total Claims: 0
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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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |