US3507480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaft kiln discharge system
Assignee: Dresser Industries Inc
•
Filing: 1968-09-25
•
Granted: 1970-04-21
•
Expires: 1988-09-25
Abstract
No abstract record available.
Inventors
- 👤 Charles D Gabor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:05
CPC Classifications
F; F27; F27B; F27B1/00; F27B1/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1932388A
Cited
GB429795A
Cited
US2277879A
Cited
US3011662A
Cited
US3064357A
Cited
US3352550A
Cited
US3429462A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-20 | 1973-10-20 | 1974-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-20 | 1977-10-20 | 1978-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-20 | 1981-10-20 | 1982-04-21 | $7700.00 | Window Closed / Lapsed |