US3491564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-hydraulic flat forming system
Assignee: ELECTRO FORM Inc
•
Filing: 1967-11-24
•
Granted: 1970-01-27
•
Expires: 1987-11-24
Abstract
No abstract record available.
Inventors
- 👤 Marvin L Hundley
- 👤 Edwin A Till Jr
- 👤 Buel O Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:07
CPC Classifications
B; B21; B21D; B21D26/00; B21D26/02; B21D26/06; B21D26/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3068822A
Cited
US3067598A
Cited
US3186203A
Cited
US3289447A
Cited
US3232086A
Cited
US3338080A
Cited
US3403539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-26 | 1973-07-28 | 1974-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-26 | 1977-07-28 | 1978-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-26 | 1981-07-28 | 1982-01-27 | $7700.00 | Window Closed / Lapsed |