US1920853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat flask
Assignee: Individual
•
Filing: 1931-05-18
•
Granted: 1933-08-01
•
Expires: 1951-05-18
Abstract
No abstract record available.
Inventors
- 👤 Ralph S Ferguson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:16
CPC Classifications
A; A61; A61F; A61F7/00; A61F7/02; A61F7/03; F; F28; F28D; F28D20/00; F28D20/02; F28D20/028; Y; Y02; Y02E; Y02E60/00; Y02E60/14; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86919
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) | 1936-07-31 | 1937-01-30 | 1937-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-07-31 | 1941-01-30 | 1941-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-07-31 | 1945-01-30 | 1945-08-01 | $7700.00 | Window Closed / Lapsed |