Patent US2993431A successfully refreshed from Google Patents.
US2993431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating device
Assignee: Individual
•
Filing: 1958-11-26
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Granted: 1961-07-25
•
Expires: 1978-11-26
Abstract
No abstract record available.
Inventors
- 👤 Weishaus Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:17
CPC Classifications
A; A47; A47J; A47J37/00; A47J37/06; A47J37/0623; A47J37/0629; A47J37/0635
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1480084A
Cited
US1522818A
Cited
US1599560A
Cited
US1900249A
Cited
US1862733A
Cited
US1955026A
Cited
US2283182A
Cited
US2604032A
Cited
US2719479A
Cited
US2804818A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |