US1489719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heater
Assignee: Individual
•
Filing: 1921-08-18
•
Granted: 1924-04-08
•
Expires: 1941-08-18
Abstract
No abstract record available.
Inventors
- 👤 Martin W Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:24
CPC Classifications
H; H05; H05B; H05B3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1927-04-08 | 1927-10-08 | 1928-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-04-08 | 1931-10-08 | 1932-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-04-08 | 1935-10-08 | 1936-04-08 | $7700.00 | Window Closed / Lapsed |