US2689560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination water and warm air heating system
Assignee: ANTHRACITE EQUIPMENT Corp
•
Filing: 1950-08-30
•
Granted: 1954-09-21
•
Expires: 1970-08-30
Abstract
No abstract record available.
Inventors
- 👤 Raymond C Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:14
CPC Classifications
F; F24; F24H; F24H6/00; F24H2230/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US340760A
Cited
US2083745A
Cited
US2054041A
Cited
US2084880A
Cited
US2252046A
Cited
US2199183A
Cited
US2455988A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |