Patent US2552259A successfully refreshed from Google Patents.
US2552259A
Expired / Lapsed
US
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Electrical heating element
Assignee: Individual
•
Filing: 1948-10-12
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Granted: 1951-05-08
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Expires: 1968-10-12
Abstract
No abstract record available.
Inventors
- 👤 Fred V Collins
- 👤 Kenneth F Spalding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:51
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C66/00; B29C66/80; B29C66/81; B29C66/818; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/40; B29C66/41
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1624029A
Cited
US1954061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |