US1761173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet-metal air heater
Assignee: Drying Systems Inc
•
Filing: 1928-11-07
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Granted: 1930-06-03
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Expires: 1948-11-07
Abstract
No abstract record available.
Inventors
- 👤 Bluemel Gustave
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:45
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0062; F28F; F28F2250/00; F28F2250/10; F28F2250/102; Y; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/067
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) | 1933-06-02 | 1933-12-02 | 1934-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-06-02 | 1937-12-02 | 1938-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-06-02 | 1941-12-02 | 1942-06-03 | $7700.00 | Window Closed / Lapsed |