US1830375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange article
Assignee: Individual
•
Filing: 1930-04-04
•
Granted: 1931-11-03
•
Expires: 1950-04-04
Abstract
No abstract record available.
Inventors
- 👤 Shoop Gertrude
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:35
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/126; F28F1/02; F28F1/04; F28F1/24; F28F1/30; F28D; F28D21/00; F28D2021/0019; F28D2021/0035
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) | 1934-11-02 | 1935-05-04 | 1935-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-11-02 | 1939-05-04 | 1939-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-11-02 | 1943-05-04 | 1943-11-03 | $7700.00 | Window Closed / Lapsed |