Patent US2500642A successfully refreshed from Google Patents.
US2500642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating system
Assignee: Individual
•
Filing: 1945-11-09
•
Granted: 1950-03-14
•
Expires: 1965-11-09
Abstract
No abstract record available.
Inventors
- 👤 Stanley H Morse
- 👤 Eldred E Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:25
CPC Classifications
F; F24; F24D; F24D3/00; F28; F28D; F28D1/00; F28D1/02; F28D1/0246
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR392563A
Cited
US1211535A
Cited
US1365807A
Cited
US1770813A
Cited
US1913002A
Cited
US2044733A
Cited
GB463071A
Cited
US2192567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |