US2997206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic catalyst releasing apparatus
Assignee: Dow Chemical Co
•
Filing: 1959-06-22
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Granted: 1961-08-22
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Expires: 1979-06-22
Abstract
No abstract record available.
Inventors
- 👤 Jan E Vandegaer
- 👤 John L Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:24
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/0015
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1582218A
Cited
US2698022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |