US2897998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floating roof seal arrangement
Assignee: Union Tank Car Co
•
Filing: 1956-08-20
•
Granted: 1959-08-04
•
Expires: 1976-08-20
Abstract
No abstract record available.
Inventors
- 👤 Reign C Ulm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:36
CPC Classifications
B; B65; B65D; B65D88/00; B65D88/34; B65D88/42; B65D88/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1597046A
Cited
US1668792A
Cited
US1900904A
Cited
US2427171A
Cited
US2459178A
Cited
US2568728A
Cited
US2685503A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |