US3520657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the analysis of off-gases in a refining process
Assignee: Dravo Corp
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Filing: 1965-12-27
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Granted: 1970-07-14
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Expires: 1985-12-27
Abstract
No abstract record available.
Inventors
- 👤 Robert Frumerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:23
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/704; C; C21; C21C; C21C5/00; C21C5/28; C21C5/30; C21C7/00; C21C7/10; Y; Y10; Y10T; Y10T436/00; Y10T436/11; Y10T436/115831; Y10T436/13; Y10T436/23
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |