Patent US2530721A successfully refreshed from Google Patents.
US2530721A
Expired / Lapsed
US
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Heater or stove
Assignee: Individual
•
Filing: 1948-10-23
•
Granted: 1950-11-21
•
Expires: 1968-10-23
Abstract
No abstract record available.
Inventors
- 👤 Perlman Samuel Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:53
CPC Classifications
A; A47; A47J; A47J36/00; A47J36/24; A47J36/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CH54396A
Cited
US1238080A
Cited
FR480588A
Cited
GB191502475A
Cited
US1487474A
Cited
US1622494A
Cited
DE599185C
Cited
US2464817A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |