US3418820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for removing vapors from gaseous mixtures by freezing
Assignee: Individual
•
Filing: 1966-11-14
•
Granted: 1968-12-31
•
Expires: 1986-11-14
Abstract
No abstract record available.
Inventors
- 👤 Judson S Swearingen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:00
CPC Classifications
F; F25; F25D; F25D21/00; F25B; F25B9/00; F25B9/002; F25B9/004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2113680A
Cited
GB275633A
Cited
US2928885A
Cited
US3093470A
Cited
US3097940A
Cited
US3261167A
Cited
US3282059A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-31 | 1972-07-01 | 1972-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-31 | 1976-07-01 | 1976-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-31 | 1980-07-01 | 1980-12-31 | $7700.00 | Window Closed / Lapsed |