US3217799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam condenser of the water tube type
Assignee: Calumet and Hecla Inc
•
Filing: 1962-03-26
•
Granted: 1965-11-16
•
Expires: 1982-03-26
Abstract
No abstract record available.
Inventors
- 👤 James S Rodgers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:05
CPC Classifications
F; F28; F28B; F28B1/00; F28B1/02; F28F; F28F1/00; F28F1/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A WATER TUBE FOR A STEAM CONDENSER HAVING AN OVERALL OUTSIDE DIAMETER OF 0.50-1.50 INCHES, AND HAVING AT ITS INNER SURFACE A SERIES OF RADIALLY INWARDLY PROJECTING RIDGE PORTIONS EXTENDING AROUND SAID TUBE, THE RATIO BETWEEN THE AXIAL SPACING OF ADJACENT RIDGE PORTIONS TO THE
Claim 2
Dependent Claim
45 words
A WATER TUBE FOR A STEAM CONDENSER HAVING AN OVERALL OUTSIDE DIAMETER OF 0.50-1.50 INCHES, AND HAVING AT ITS INNER SURFACE A SERIES OF RADIALLY INWARDLY PROJECTING RIDGE PORTIONS EXTENDING AROUND SAID TUBE, THE RATIO BETWEEN THE AXIAL SPACING OF ADJACENT RIDGE PORTIONS TO THE
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |