Patent US1897723A successfully refreshed from Google Patents.
US1897723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerating device
Assignee: Individual
•
Filing: 1927-04-29
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Granted: 1933-02-14
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Expires: 1947-04-29
Abstract
No abstract record available.
Inventors
- 👤 Walter H Free
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:31
CPC Classifications
F; F25; F25D; F25D5/00; F25D5/02; A; A61; A61B; A61B18/00; A61B18/02
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) | 1936-02-14 | 1936-08-15 | 1937-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-02-14 | 1940-08-15 | 1941-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-02-14 | 1944-08-15 | 1945-02-14 | $7700.00 | Window Closed / Lapsed |