US3387078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffusion furnace with flat recovery
Assignee: Centigrade Systems Inc
•
Filing: 1966-06-15
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Granted: 1968-06-04
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Expires: 1986-06-15
Abstract
No abstract record available.
Inventors
- 👤 Jr William S Montgomery
- 👤 Ronald E Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:45
CPC Classifications
F; F27; F27D; F27D11/00; F27D11/02; H; H05; H05B; H05B3/00; H05B3/0019
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3311694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-04 | 1971-12-04 | 1972-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-04 | 1975-12-04 | 1976-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-04 | 1979-12-04 | 1980-06-04 | $7700.00 | Window Closed / Lapsed |