US3540255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for making hollow metal articles
Assignee: Russell Burdsall and Ward Corp
•
Filing: 1967-12-13
•
Granted: 1970-11-17
•
Expires: 1987-12-13
Abstract
No abstract record available.
Inventors
- 👤 Edward C Hanna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:22
CPC Classifications
B; B21; B21K; B21K1/00; B21K1/58; B21K1/60; B21C; B21C23/00; B21C23/02; B21C23/20; B21J; B21J5/00; B21J5/06; B21J5/08; B21K1/64; B21K21/00; B21K21/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3126561A
Cited
US2395721A
Cited
US2667650A
Cited
US2715232A
Cited
US3186209A
Cited
US3417597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-16 | 1974-05-18 | 1974-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-16 | 1978-05-18 | 1978-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-16 | 1982-05-18 | 1982-11-17 | $7700.00 | Window Closed / Lapsed |