Patent US4820090A successfully refreshed from Google Patents.
Patent US2617233A successfully refreshed from Google Patents.
US2617233A
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Oxygen transfer regulator
Assignee: Union Carbide Corp
•
Filing: 1945-05-03
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Granted: 1952-11-11
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Expires: 1965-05-03
Abstract
No abstract record available.
Inventors
- 👤 James A Hoffman
- 👤 Samuel R Oldham
- 👤 Wilgot J Jacobsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:44
CPC Classifications
A; A62; A62B; A62B9/00; A62B9/02; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/2937; Y10T137/294; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7764; Y10T137/7768
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |