US2050002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration system
Assignee: ERNEST F WALKER
•
Filing: 1934-10-06
•
Granted: 1936-08-04
•
Expires: 1954-10-06
Abstract
No abstract record available.
Inventors
- 👤 James W Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:40
CPC Classifications
F; F25; F25B; F25B5/00; F25B5/02; F25B41/00; F25B41/20; F25B41/22; F25B41/30; F25B41/31; F25B41/315; F25B49/00; F25B49/02; F25B49/025; F25B2600/00; F25B2600/02; F25B2600/025; F25B2600/0251
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1939-08-04 | 1940-02-03 | 1940-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-08-04 | 1944-02-03 | 1944-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-08-04 | 1948-02-03 | 1948-08-04 | $7700.00 | Window Closed / Lapsed |