US2568975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lightweight refrigerant block
Assignee: Individual
•
Filing: 1948-11-22
•
Granted: 1951-09-25
•
Expires: 1968-11-22
Abstract
No abstract record available.
Inventors
- 👤 Robert E Warne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:12
CPC Classifications
F; F25; F25D; F25D3/00; A; A23; A23B; A23B2/00; A23B2/80; A23B2/805; A23B2/8055; F25D2303/00; F25D2303/08; F25D2303/082; F25D2303/0822; F25D2303/085; F25D2331/00; F25D2331/80; F25D2331/804
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1727878A
Cited
US2087966A
Cited
US2154933A
Cited
US2210946A
Cited
US2216365A
Cited
US2288745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-24 | 1955-03-26 | 1955-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-24 | 1959-03-26 | 1959-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-24 | 1963-03-26 | 1963-09-25 | $7700.00 | Window Closed / Lapsed |