Patent US2558971A successfully refreshed from Google Patents.
US2558971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water heater
Assignee: Individual
•
Filing: 1945-09-17
•
Granted: 1951-07-03
•
Expires: 1965-09-17
Abstract
No abstract record available.
Inventors
- 👤 Allan W Lundstrum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:43
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/18; F24H1/20; F24H1/205
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) | 1954-07-02 | 1955-01-01 | 1955-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-02 | 1959-01-01 | 1959-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-02 | 1963-01-01 | 1963-07-03 | $7700.00 | Window Closed / Lapsed |