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Patent US1551822A successfully refreshed from Google Patents.
US1551822A
Expired / Lapsed
US
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Electric heating apparatus
Assignee: Electrical Improvements Ltd
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Filing: 1924-12-22
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Granted: 1925-09-01
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Expires: 1944-12-22
Abstract
No abstract record available.
Inventors
- 👤 Grant Lewis Colin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:21
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1928-08-31 | 1929-03-02 | 1929-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-08-31 | 1933-03-02 | 1933-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-08-31 | 1937-03-02 | 1937-09-01 | $7700.00 | Window Closed / Lapsed |