US3513307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper smelting converter having an infrared analyzer for determining the concentration of sulfur dioxide in the flue gas
Assignee: Canadian Patents and Development Ltd
•
Filing: 1966-11-14
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Granted: 1970-05-19
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Expires: 1986-11-14
Abstract
No abstract record available.
Inventors
- 👤 Earl Howard Dudgeon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:15
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0095; C22B15/0026; C22B15/0028; C22B15/003; C22B15/0041
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2269674A
Cited
US2462995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |