US2775550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of c1 carbon content in tar
Assignee: Beazer East Inc
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Filing: 1954-04-16
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Granted: 1956-12-25
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Expires: 1974-04-16
Abstract
No abstract record available.
Inventors
- 👤 Earl V Harlow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:11
CPC Classifications
C; C10; C10C; C10C1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
IN A PROCESS OF FILTERING TAR TO PROVIDE A TAR FILTRATE SUBTANTIALLY FREE OF C1 PARTICLES THE STEP WHICH COMPRISES: FLOWING LIQUIFIED TAR AT A LINEAR VELOCITY OF FROM ABOUT 4 TO ABOUT 16 FEET PER SECOND ACROSS THE SURFACE OF A FILTER SCREEN TO BUILD AND MAINTAIN A THIN, TENACIOUS MEMBRANE OF C1 PARTICLES THEREON, THE TAR FLOWING ACROSS AND NOT THROUGH THE SCREEN HAVING AN INCREASED AMOUNT OF C1 PARTICLES AND THE TAR WHICH FLOWS THROUGH THE SCREEN HAVING A DECREASED AMOUNT OF C1 PARTICLES.
Claim 2
Dependent Claim
87 words
IN A PROCESS OF FILTERING TAR TO PROVIDE A TAR FILTRATE SUBTANTIALLY FREE OF C1 PARTICLES THE STEP WHICH COMPRISES: FLOWING LIQUIFIED TAR AT A LINEAR VELOCITY OF FROM ABOUT 4 TO ABOUT 16 FEET PER SECOND ACROSS THE SURFACE OF A FILTER SCREEN TO BUILD AND MAINTAIN A THIN, TENACIOUS MEMBRANE OF C1 PARTICLES THEREON, THE TAR FLOWING ACROSS AND NOT THROUGH THE SCREEN HAVING AN INCREASED AMOUNT OF C1 PARTICLES AND THE TAR WHICH FLOWS THROUGH THE SCREEN HAVING A DECREASED AMOUNT OF C1 PARTICLES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |