US3385921A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffusion furnace with high speed recovery
Assignee: Electroglas Inc
•
Filing: 1967-06-21
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Granted: 1968-05-28
•
Expires: 1987-06-21
Abstract
No abstract record available.
Inventors
- 👤 Gordon P Hampton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:48
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/0019
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3227797A
Cited
US3291969A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-28 | 1971-11-27 | 1972-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-28 | 1975-11-27 | 1976-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-28 | 1979-11-27 | 1980-05-28 | $7700.00 | Window Closed / Lapsed |