US3449552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Space heater construction
Assignee: EHD Inc
•
Filing: 1965-10-11
•
Granted: 1969-06-10
•
Expires: 1985-10-11
Abstract
No abstract record available.
Inventors
- 👤 Howard K Graves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:02
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/002; H; H05; H05B; H05B3/00; H05B3/40; H05B3/42; H05B3/48; H05B3/50; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB189625489A
Cited
US760076A
Cited
US826008A
Cited
US1282243A
Cited
US2019913A
Cited
US2080797A
Cited
US2053933A
Cited
US2687626A
Cited
US2893639A
Cited
US3031171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |