US2581558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural stage cooling machine
Assignee: PETROCARBON Ltd
•
Filing: 1948-10-12
•
Granted: 1952-01-08
•
Expires: 1968-10-12
Abstract
No abstract record available.
Inventors
- 👤 Ruhemann Martin Siegfr William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:18
CPC Classifications
F; F25; F25B; F25B1/00; F25B9/00; F25B9/002; F25B9/006; F25J; F25J1/00; F25J1/0002; F25J1/0022; F25J1/003; F25J1/0047; F25J1/0052; F25J1/0055; F25J1/02; F25J1/0211; F25J1/0212; F25J1/0243; F25J1/0244; F25J1/0245; F25J1/0249; F25J1/0257; F25J1/0262; F25J1/0264; F25J1/0265; Y; Y10; Y10S; Y10S62/00; Y10S62/912
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1325665A
Cited
US2041725A
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US2278889A
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US2341320A
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US2453823A
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US2456386A
Cited
US2458560A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |