US2803842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger tube reamer
Assignee: California Research LLC
•
Filing: 1955-10-07
•
Granted: 1957-08-27
•
Expires: 1975-10-07
Abstract
No abstract record available.
Inventors
- 👤 Joseph C Fuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:19
CPC Classifications
F; F28; F28G; F28G3/00; F28G3/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US261978A
Cited
US513947A
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US592953A
Cited
US677119A
Cited
US1109533A
Cited
US1475989A
Cited
US2380098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |