US2331950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas heater
Assignee: DAY AND NIGHT WATER HEATER CO
•
Filing: 1939-12-04
•
Granted: 1943-10-19
•
Expires: 1959-12-04
Abstract
No abstract record available.
Inventors
- 👤 Frank E Wood
- 👤 William G Cartter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:41
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/30; F24C3/00; F24C3/04; F24C3/042
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) | 1946-10-18 | 1947-04-19 | 1947-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-10-18 | 1951-04-19 | 1951-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-10-18 | 1955-04-19 | 1955-10-19 | $7700.00 | Window Closed / Lapsed |