US3689299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing pitch bound aggregate
Assignee: Qo Chemicals Inc
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Filing: 1971-03-16
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Granted: 1972-09-05
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Expires: 1991-03-16
Abstract
Abstract IMPROVED PROCESS FOR PRODUCING BOUND AGGREGATE WITH A THERMOSETTING BINDER COMPRISING A MODIFIED PETROLEUM PITCH PLASTICIZER AND POWDERED PITCH, USEFUL EXAMPLE, IN PRODUCING REFRACTORY LININGS AND CARBON ELECTRODES.
Inventors
- 👤 Lloyd H Brown
- 👤 David D Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:07
CPC Classifications
C; C08; C08L; C08L95/00; C10; C10C; C10C3/00; C10C3/02; C10C3/026
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |