Patent US3093940A successfully refreshed from Google Patents.
Patent US2594929A successfully refreshed from Google Patents.
US2594929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for refining trinidad lake asphalt
Assignee: Barber Oil Corp
•
Filing: 1948-07-14
•
Granted: 1952-04-29
•
Expires: 1968-07-14
Abstract
No abstract record available.
Inventors
- 👤 Howell Henry Clay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:47
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
THE METHOD OF REFINING TRINIDAD LAKE ASPHALT WHICH COMPRISES THE STEPS OF JIGGING A GROUND MASS OF CRUDE TRINIDAD LAKE ASPHALT TO SEPARATE THEREFROM QUARTZ PARTICLES OF A SIZE OF 50 MESH AND GREATER AND SUBJECTING THE PORTION OF THE JIGGED MASS CONTAINING QUARTZ PARTICLES OF A SIZE LESS THAN 50 MESH TO HYDRAULIC CLASSIFICATION IN A HYDRAULIC CLASSIFIER ADJUSTED TO OVERFLOW QUARTZ PARTICLES OF A SIZE LESS THAN 20 MICRONS, AND BITUMEN.
Claim 2
Independent Claim
73 words
THE METHOD OF REFINING TRINIDAD LAKE ASPHALT WHICH COMPRISES THE STEPS OF JIGGING A GROUND MASS OF CRUDE TRINIDAD LAKE ASPHALT TO SEPARATE THEREFROM QUARTZ PARTICLES OF A SIZE OF 50 MESH AND GREATER AND SUBJECTING THE PORTION OF THE JIGGED MASS CONTAINING QUARTZ PARTICLES OF A SIZE LESS THAN 50 MESH TO HYDRAULIC CLASSIFICATION IN A HYDRAULIC CLASSIFIER ADJUSTED TO OVERFLOW QUARTZ PARTICLES OF A SIZE LESS THAN 20 MICRONS, AND BITUMEN.
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) | 1955-04-29 | 1955-10-29 | 1956-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-29 | 1959-10-29 | 1960-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-29 | 1963-10-29 | 1964-04-29 | $7700.00 | Window Closed / Lapsed |