US2564358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentric gas and air burner for water heaters
Assignee: Individual
•
Filing: 1947-09-29
•
Granted: 1951-08-14
•
Expires: 1967-09-29
Abstract
No abstract record available.
Inventors
- 👤 Paul L Fowler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:34
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/18; F24H1/186; F23; F23D; F23D14/00; F23D14/02; F23D14/04; F23D99/00; F23D99/002; F23D99/004; F23D2206/00; F23D2206/0094
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-13 | 1955-02-12 | 1955-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-13 | 1959-02-12 | 1959-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-13 | 1963-02-12 | 1963-08-14 | $7700.00 | Window Closed / Lapsed |