US3421587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for mine fire control
Assignee: Dayton Fly Ash Co Inc
•
Filing: 1967-09-20
•
Granted: 1969-01-14
•
Expires: 1987-09-20
Abstract
No abstract record available.
Inventors
- 👤 Jerry L Heavilon
- 👤 Dennis A Jones
- 👤 Barton A Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:30
CPC Classifications
E; E21; E21F; E21F17/00; E21F17/103
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE16914E
Cited
US1261922A
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US1435957A
Cited
US1556879A
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US2368209A
Cited
DE1112032B
Cited
US3186490A
Cited
US3194443A
Cited
US3333896A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |