US2858115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Finned tubing
Assignee: Individual
•
Filing: 1956-02-23
•
Granted: 1958-10-28
•
Expires: 1976-02-23
Abstract
No abstract record available.
Inventors
- 👤 Esther B Stebbins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:24
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US406332A
Cited
GB189704556A
Cited
US933371A
Cited
US1950112A
Cited
US1949984A
Cited
US2036417A
Cited
US2156538A
Cited
US2726850A
Cited
US2709074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |