US2580033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heater
Assignee: Individual
•
Filing: 1946-08-15
•
Granted: 1951-12-25
•
Expires: 1966-08-15
Abstract
No abstract record available.
Inventors
- 👤 Joseph H Loweth
- 👤 John E Scharff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:31
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/22; F24H1/40; F24H1/38; F24H1/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US519297A
Cited
US1576646A
Cited
GB189920473A
Cited
US930140A
Cited
GB218519A
Cited
FR761780A
Cited
US2426004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |