Patent US3409727A successfully refreshed from Google Patents.
US3409727A
Expired / Lapsed
US
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Diffusion furnace
Assignee: Electroglas Inc
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Filing: 1967-06-21
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Granted: 1968-11-05
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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
2026-10-31 03:53
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/62; F; F27; F27D; F27D11/00; F27D11/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2661385A
Cited
US2010768A
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US2611790A
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US2831909A
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US2895433A
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US3083445A
Cited
US3128326A
Cited
US3140335A
Cited
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 |