US2507380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dilution of refrigerant gases
Assignee: Individual
•
Filing: 1947-04-28
•
Granted: 1950-05-09
•
Expires: 1967-04-28
Abstract
No abstract record available.
Inventors
- 👤 Willard L Morrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:10
CPC Classifications
F; F25; F25B; F25B45/00; F25B2345/00; F25B2345/002; F25B2345/004; F25B2400/00; F25B2400/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2248308A
Cited
US2341268A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-08 | 1953-11-07 | 1954-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-08 | 1957-11-07 | 1958-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-08 | 1961-11-07 | 1962-05-09 | $7700.00 | Window Closed / Lapsed |