US2860252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal testing method
Assignee: Stamicarbon BV
•
Filing: 1955-05-03
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Granted: 1958-11-11
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Expires: 1975-05-03
Abstract
No abstract record available.
Inventors
- 👤 Dijkstra Hendrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:02
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/22; G01N33/222; G01N23/00; G01N23/20; G01N23/203
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A METHOD OF TESTING COAL TO DETERMINE THE ASH CONTENT THEREOF, COMPRISING THE STEP OF MEASURING THE ROENTEGEN RAYS DISPERSION CAPACITY OF THE COAL EMPLOYING A TECHNICAL ROETENGEN RADIATION COMPOSED ENTIRELY OF RAYS HAVING A WAVE LENGTH GREATER THAN 1.74 AND LESS THAN 4.5 A. U.
Claim 2
Independent Claim
46 words
A METHOD OF TESTING COAL TO DETERMINE THE ASH CONTENT THEREOF, COMPRISING THE STEP OF MEASURING THE ROENTEGEN RAYS DISPERSION CAPACITY OF THE COAL EMPLOYING A TECHNICAL ROETENGEN RADIATION COMPOSED ENTIRELY OF RAYS HAVING A WAVE LENGTH GREATER THAN 1.74 AND LESS THAN 4.5 A. U.
References Cited (Backward Citations)
US2635192A
Cited
US2617942A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |