US2839657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Space heater
Assignee: COMMERCIAL CONTROIS Corp
•
Filing: 1956-11-01
•
Granted: 1958-06-17
•
Expires: 1976-11-01
Abstract
No abstract record available.
Inventors
- 👤 Lowell R Mast
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:57
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0405; F24H3/0411; F24H3/0417
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1531520A
Cited
US1998670A
Cited
US1967757A
Cited
US2120795A
Cited
US2415621A
Cited
US2590600A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |