US1523927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for making spiral tubing by electric welding
Assignee: AO Smith Corp
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Filing: 1923-10-11
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Granted: 1925-01-20
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Expires: 1943-10-11
Abstract
No abstract record available.
Inventors
- 👤 John D Beebe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:31
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/12; B21C37/122
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) | 1928-01-20 | 1928-07-21 | 1929-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-01-20 | 1932-07-21 | 1933-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-01-20 | 1936-07-21 | 1937-01-20 | $7700.00 | Window Closed / Lapsed |