US2039423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion heater
Assignee: ANTHRACITE DEVICES Corp
•
Filing: 1935-03-25
•
Granted: 1936-05-05
•
Expires: 1955-03-25
Abstract
No abstract record available.
Inventors
- 👤 Allen J Johnson
- 👤 Paul A Mulcey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:41
CPC Classifications
F; F23; F23B; F23B30/00; F23B30/02; F23B30/06; F23B30/10; F23B50/00; F23B50/02; F23B50/04; F23B80/00; F23B2700/00; F23B2700/011
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) | 1939-05-05 | 1939-11-04 | 1940-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-05-05 | 1943-11-04 | 1944-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-05-05 | 1947-11-04 | 1948-05-05 | $7700.00 | Window Closed / Lapsed |