Patent US2559870A successfully refreshed from Google Patents.
US2559870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
House heating system
Assignee: Individual
•
Filing: 1949-08-24
•
Granted: 1951-07-10
•
Expires: 1969-08-24
Abstract
No abstract record available.
Inventors
- 👤 Frazer W Gay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:28
CPC Classifications
F; F24; F24D; F24D11/00; F24D11/02; F24D11/0257; F24D11/0264; F24V; F24V50/00; Y; Y02; Y02B; Y02B10/00; Y02B10/20; Y02B10/70; Y02B30/00; Y02B30/13
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2178176A
Cited
US2462557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-09 | 1955-01-08 | 1955-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-09 | 1959-01-08 | 1959-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-09 | 1963-01-08 | 1963-07-10 | $7700.00 | Window Closed / Lapsed |