US2678600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compression and heat exchange apparatus
Assignee: Celanese Corp
•
Filing: 1952-03-05
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Granted: 1954-05-18
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Expires: 1972-03-05
Abstract
No abstract record available.
Inventors
- 👤 Jr Lyman H Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:53
CPC Classifications
C; C08; C08B; C08B1/00; C08B1/08; C08B1/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1750916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-17 | 1957-11-16 | 1958-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-17 | 1961-11-16 | 1962-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-17 | 1965-11-16 | 1966-05-18 | $7700.00 | Window Closed / Lapsed |