US3427997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inflatable bulkhead for railroad car
Assignee: Individual
•
Filing: 1967-05-19
•
Granted: 1969-02-18
•
Expires: 1987-05-19
Abstract
No abstract record available.
Inventors
- 👤 Neuberne H Brown Jr
- 👤 David P Butler
- 👤 Jack M Carter
- 👤 Michael Ferik
- 👤 Paul E Ogle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:55
CPC Classifications
B; B60; B60P; B60P7/00; B60P7/06; B60P7/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1613057A
Cited
US2856867A
Cited
US3115977A
Cited
US3145853A
Cited
US3192879A
Cited
US3177816A
Cited
US3208403A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |