US1899080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange device
Assignee: Res & Dev Corp
•
Filing: 1931-10-29
•
Granted: 1933-02-28
•
Expires: 1951-10-29
Abstract
No abstract record available.
Inventors
- 👤 Herbert V Dalgliesh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:30
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0031; F28F; F28F3/00; F28F3/02; F28F3/025; F28F3/027; F28F9/00; F28F9/26; Y; Y10; Y10S; Y10S165/00; Y10S165/454; Y10S165/464
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) | 1936-02-28 | 1936-08-29 | 1937-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-02-28 | 1940-08-29 | 1941-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-02-28 | 1944-08-29 | 1945-02-28 | $7700.00 | Window Closed / Lapsed |