US2620431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined electric hot water heater, flue, and chimney unit
Assignee: MARIE T SHEPHEARD
•
Filing: 1952-03-17
•
Granted: 1952-12-02
•
Expires: 1972-03-17
Abstract
No abstract record available.
Inventors
- 👤 William L Shepheard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:29
CPC Classifications
F; F24; F24D; F24D12/00; F24D12/02; F24D2200/00; F24D2200/08; F24D2200/16; F24D2200/18; Y; Y02; Y02B; Y02B10/00; Y02B10/70; Y02B30/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |