US2237054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating equipment
Assignee: Individual
•
Filing: 1937-11-13
•
Granted: 1941-04-01
•
Expires: 1957-11-13
Abstract
No abstract record available.
Inventors
- 👤 Donald G Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:49
CPC Classifications
F; F28; F28D; F28D15/00; F28D15/02; F28D15/0275; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1944-03-31 | 1944-09-30 | 1945-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-03-31 | 1948-09-30 | 1949-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-03-31 | 1952-09-30 | 1953-04-01 | $7700.00 | Window Closed / Lapsed |