Patent US6358251B1 successfully refreshed from Google Patents.
US3560347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for carbonizing carbonaceous materials using microwave energy
Assignee: COAL PRODUCTS Inc
•
Filing: 1969-06-02
•
Granted: 1971-02-02
•
Expires: 1989-06-02
Abstract
Abstract COAL IS FIRST PREHEATED IN A FIRST CHAMBER BY DIRECT CONTACT WITH HOT GASES AND IS THEN CARBONIZED IN A SECOND CHAMBER USING MICROWAVE ENERGY AS THE HEAT SOURCE. THE VOLATILE MATERIAL FROM THE SECOND CHAMBER IS FRACTIONALLY CONDENSED.
Inventors
- 👤 Edward M Knapp
- 👤 Weldon T Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:20
CPC Classifications
C; C10; C10B; C10B19/00; B; B01; B01D; B01D5/00; B01D5/0033; B01D5/0039; C10B49/00; C10B49/02; C10B49/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |