US2861188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal testing method
Assignee: Stamicarbon BV
•
Filing: 1954-03-05
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Granted: 1958-11-18
•
Expires: 1974-03-05
Abstract
No abstract record available.
Inventors
- 👤 Dijkstra Hendrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:55
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/02; G01N23/06; G01N23/083
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A METHOD OF TESTING COAL TO DETERMINE THE ASH CONTENT THEREOF, COMPRISING THE STEPS OF SUBJECTING THE COAL TO X-RAY RADIATION COMPOSED SUBSTANTIALLY ENTIRELY OF RAYS HAVING A WAVE LENGTH GREATER THAN 1.74 A. U., AND MEASURING THE X-RAY ABSORPTION CAPACITY OF THE COAL, THE X-RAY ABSORPTION CAPACITY BEING EMPIRICALLY RELATED TO THE ASH CONTENT.
Claim 2
Independent Claim
55 words
A METHOD OF TESTING COAL TO DETERMINE THE ASH CONTENT THEREOF, COMPRISING THE STEPS OF SUBJECTING THE COAL TO X-RAY RADIATION COMPOSED SUBSTANTIALLY ENTIRELY OF RAYS HAVING A WAVE LENGTH GREATER THAN 1.74 A. U., AND MEASURING THE X-RAY ABSORPTION CAPACITY OF THE COAL, THE X-RAY ABSORPTION CAPACITY BEING EMPIRICALLY RELATED TO THE ASH CONTENT.
References Cited (Backward Citations)
US2316239A
Cited
US2534352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-17 | 1962-05-19 | 1962-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-17 | 1966-05-19 | 1966-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-17 | 1970-05-19 | 1970-11-18 | $7700.00 | Window Closed / Lapsed |