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US2891401A
Expired / Lapsed
US
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Method for testing the concentration of sulfuric acid used for catalyzing reactions
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1954-03-03
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Granted: 1959-06-23
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Expires: 1974-03-03
Abstract
No abstract record available.
Inventors
- 👤 Raymond L Heinrich
- 👤 Mathis T Waddell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:34
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/20; G01N25/48
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) | 1962-06-22 | 1962-12-22 | 1963-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-22 | 1966-12-22 | 1967-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-22 | 1970-12-22 | 1971-06-23 | $7700.00 | Window Closed / Lapsed |