US3328187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of expanded shale
Assignee: McDowell-Wellman Engineering Co
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Filing: 1964-10-28
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Granted: 1967-06-27
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Expires: 1984-10-28
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Ban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:26
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06; C04B20/063
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A PROCESS FOR THE MANUFACTURE OF EXPANDED SHALE COMPRISING THE STEPS OF PREPARING A BED CONSISTING ESSENTIALLY OF FROM 90% TO 99% BY WEIGHT OF A NATURALLYOCCURRING SHALE AND FROM 1% TO 10% BY WEIGHT OF A CARBONACEOUS MATERIAL, MOVING SAID BED INTO A PRE-HEATING ZONE MAINTAINED AT A TEMPERATURE IN THE RANGE OF 1500*F. TO 1850*F. AND MAINTAINING SAID BED THEREIN FOR A PERIOD OF AT LEAST 6 MINUTES, NEXT MOVING SAID BED INTO A SECOND ZONE MAINTAINED AT A TEMPERATURE IN THE RANGE OF 2050*F. TO 2250*F. AND MAINTAINING SAID BED THEREIN FOR A PERIOD OF AT LEAST TWO MINUTES, AND, FINALLY, MOVING SAID BED INTO A THIRD ZONE MAINTAINED AT A TEMPERATURE OF 2300*F. TO 2500*F. AND MAINTAINING SAID BED THEREIN FOR A PERIOD OF AT LEAST TWO MINUTES.
Claim 2
Dependent Claim
132 words
A PROCESS FOR THE MANUFACTURE OF EXPANDED SHALE COMPRISING THE STEPS OF PREPARING A BED CONSISTING ESSENTIALLY OF FROM 90% TO 99% BY WEIGHT OF A NATURALLYOCCURRING SHALE AND FROM 1% TO 10% BY WEIGHT OF A CARBONACEOUS MATERIAL, MOVING SAID BED INTO A PRE-HEATING ZONE MAINTAINED AT A TEMPERATURE IN THE RANGE OF 1500*F. TO 1850*F. AND MAINTAINING SAID BED THEREIN FOR A PERIOD OF AT LEAST 6 MINUTES, NEXT MOVING SAID BED INTO A SECOND ZONE MAINTAINED AT A TEMPERATURE IN THE RANGE OF 2050*F. TO 2250*F. AND MAINTAINING SAID BED THEREIN FOR A PERIOD OF AT LEAST TWO MINUTES, AND, FINALLY, MOVING SAID BED INTO A THIRD ZONE MAINTAINED AT A TEMPERATURE OF 2300*F. TO 2500*F. AND MAINTAINING SAID BED THEREIN FOR A PERIOD OF AT LEAST TWO MINUTES.
References Cited (Backward Citations)
US2729570A
Cited
US2948630A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-26 | 1970-12-26 | 1971-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-26 | 1974-12-26 | 1975-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-26 | 1978-12-26 | 1979-06-27 | $7700.00 | Window Closed / Lapsed |