Patent US2580111A successfully refreshed from Google Patents.
US2580111A
Expired / Lapsed
US
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Heating system
Assignee: GEORGE FINKELSTEIN
•
Filing: 1948-04-06
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Granted: 1951-12-25
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Expires: 1968-04-06
Abstract
No abstract record available.
Inventors
- 👤 Mannist Milton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:27
CPC Classifications
F; F24; F24D; F24D5/00; F24D5/06; F24D5/10; F24D13/00; F24D13/02; F24D13/022; F24D13/024; F24D5/02; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1566772A
Cited
US1288507A
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US1570162A
Cited
US1891595A
Cited
US1875685A
Cited
GB374593A
Cited
US1993410A
Cited
US2235764A
Cited
US2418557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |