US2543430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plug for sealing tube sheets
Assignee: Condenser Service & Engineerin
•
Filing: 1945-12-17
•
Granted: 1951-02-27
•
Expires: 1965-12-17
Abstract
No abstract record available.
Inventors
- 👤 Olaf F Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:15
CPC Classifications
F; F28; F28F; F28F11/00; F28F11/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US235653A
Cited
US354859A
Cited
US956797A
Cited
US1387451A
Cited
US1617451A
Cited
US1661997A
Cited
US1714703A
Cited
US2396469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-26 | 1954-08-28 | 1955-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-26 | 1958-08-28 | 1959-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-26 | 1962-08-28 | 1963-02-27 | $7700.00 | Window Closed / Lapsed |