Patent US2431673A successfully refreshed from Google Patents.
US2431673A
Expired / Lapsed
US
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Electric heater for frost shields
Assignee: Individual
•
Filing: 1945-05-23
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Granted: 1947-12-02
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Expires: 1965-05-23
Abstract
No abstract record available.
Inventors
- 👤 William F Auger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:40
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/84
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE20628E
Cited
US1721663A
Cited
US1945742A
Cited
FR790048A
Cited
US2195862A
Cited
US2360299A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-01 | 1951-06-02 | 1951-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-01 | 1955-06-02 | 1955-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-01 | 1959-06-02 | 1959-12-02 | $7700.00 | Window Closed / Lapsed |