US2682157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas separation
Assignee: HEAT X CHANGER CO Inc
•
Filing: 1950-11-03
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Granted: 1954-06-29
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Expires: 1970-11-03
Abstract
No abstract record available.
Inventors
- 👤 Boling Cecil
- 👤 Alexander J Tigges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:03
CPC Classifications
F; F25; F25J; F25J5/00; F25J3/00; F25J3/02; F25J3/04; F25J3/04151; F25J2210/00; F25J2210/40
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) | 1957-06-28 | 1957-12-28 | 1958-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-28 | 1961-12-28 | 1962-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-28 | 1965-12-28 | 1966-06-29 | $7700.00 | Window Closed / Lapsed |