US1930756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary apparatus for contacting gaseous and nongaseous materials and gas sealed joint therefor
Assignee: Dow Chemical Co
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Filing: 1932-07-01
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Granted: 1933-10-17
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Expires: 1952-07-01
Abstract
No abstract record available.
Inventors
- 👤 Sheldon B Heath
- 👤 Ormond E Barstow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:15
CPC Classifications
F; F27; F27D; F27D99/00; F27D99/0073; F27D99/0075; F27B; F27B7/00; F27B7/20; F27B7/22; F27B7/24; F27B7/32; F27B7/3205; F27B2007/3211; F27B2007/3217; F27D3/00; F27D3/08; Y; Y10; Y10S; Y10S277/00; Y10S277/903
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1936-10-16 | 1937-04-17 | 1937-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-10-16 | 1941-04-17 | 1941-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-10-16 | 1945-04-17 | 1945-10-17 | $7700.00 | Window Closed / Lapsed |