Patent US3408850A successfully refreshed from Google Patents.
US3408850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube bending mandrel
Assignee: H & H Engineering Co
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Filing: 1966-03-18
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Granted: 1968-11-05
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Expires: 1986-03-18
Abstract
No abstract record available.
Inventors
- 👤 Dale E Maier
- 👤 Frederick A Nelson
- 👤 Ervin V Hofman
- 👤 Richard Van Stelle
- 👤 Joseph A Cwik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:55
CPC Classifications
B; B21; B21D; B21D9/00; B21D9/01; B21D9/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |