US1937774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air heating apparatus
Assignee: Marley Wylain Co LLC
•
Filing: 1931-05-01
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Granted: 1933-12-05
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Expires: 1951-05-01
Abstract
No abstract record available.
Inventors
- 👤 Harry G Naylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:18
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/0246; F28F; F28F9/00; F28F9/26; F28F9/262; F28F9/264; 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) | 1936-12-04 | 1937-06-05 | 1937-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-12-04 | 1941-06-05 | 1941-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-12-04 | 1945-06-05 | 1945-12-05 | $7700.00 | Window Closed / Lapsed |