US2940154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making light weight aggregate from bituminous coal refuse
Assignee: Individual
•
Filing: 1956-11-05
•
Granted: 1960-06-14
•
Expires: 1976-11-05
Abstract
No abstract record available.
Inventors
- 👤 Charles N Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:46
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06; C04B20/063; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1854899A
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US1842801A
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US1896625A
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US1896884A
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US2209636A
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US2366400A
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US2414734A
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US2410267A
Cited
US2456207A
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US2536365A
Cited
US2729570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |