US2534031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Defrosting system for refrigerators
Assignee: Individual
•
Filing: 1944-08-19
•
Granted: 1950-12-12
•
Expires: 1964-08-19
Abstract
No abstract record available.
Inventors
- 👤 Kollsman Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:31
CPC Classifications
F; F25; F25B; F25B47/00; F25B47/02; F25B47/022; F25B47/025; F25B41/00; F25B41/20; F25B41/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1538486A
Cited
US1912841A
Cited
US2129373A
Cited
US2128386A
Cited
US2143687A
Cited
US2351140A
Cited
US2366635A
Cited
US2324309A
Cited
US2446910A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |