US2600871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous conveyer-reactor chamber
Assignee: Gulf Research and Development Co
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Filing: 1949-06-27
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Granted: 1952-06-17
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Expires: 1969-06-27
Abstract
No abstract record available.
Inventors
- 👤 Ralph W Helwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:58
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/08; B01J8/10; B01D; B01D53/00; B01D53/34; B01J2219/00; B01J2219/18; B01J2219/182
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) | 1955-06-17 | 1955-12-17 | 1956-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-17 | 1959-12-17 | 1960-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-17 | 1963-12-17 | 1964-06-17 | $7700.00 | Window Closed / Lapsed |