US3749688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified coal-tar-pitch compositions and process for preparing same
Assignee: Braskem America Inc
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Filing: 1971-02-24
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Granted: 1973-07-31
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Expires: 1991-02-24
Abstract
Abstract THIS INVENTION RELATES TO PLASTIC COATING MATERIALS, TO COAL-TAR-PITCH-DERIVED BAKED PROTECTIVE-COATING MATERIALS THAT ARE HEAT AND SOLVENT RESISTANT, TO SEMIRIGD THERMOSETTING FOAMS PREPARED FROM EXPANDABLE COAL-TAR-PITCHPOLYESTER COMPOSITIONS, AND TO PROCEDURES FOR PREPARING SUCH MATERIALS.
Inventors
- 👤 E Mihelic
- 👤 M Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:34
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/02; C10C3/026; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C09; C09D; C09D195/00
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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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |