US1925822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of heating and ventilating
Assignee: Herman Nelson Co
•
Filing: 1931-05-08
•
Granted: 1933-09-05
•
Expires: 1951-05-08
Abstract
No abstract record available.
Inventors
- 👤 Shurtleff Wilfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:56
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/0233; F28D1/024; Y; Y10; Y10S; Y10S236/00; Y10S236/09
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) | 1936-09-04 | 1937-03-06 | 1937-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-09-04 | 1941-03-06 | 1941-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-09-04 | 1945-03-06 | 1945-09-05 | $7700.00 | Window Closed / Lapsed |