US3361420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat treatment apparatus
Assignee: Wellman Incandescent Furnace Co Ltd
•
Filing: 1964-11-25
•
Granted: 1968-01-02
•
Expires: 1984-11-25
Abstract
No abstract record available.
Inventors
- 👤 Morgan Francis John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:20
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/663; C21D1/00; C21D1/74; C21D1/767
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1985950A
Cited
GB455089A
Cited
US2245647A
Cited
US2479814A
Cited
US2789808A
Cited
FR1197727A
Cited
US3100634A
Cited
US3140743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-01 | 1971-07-03 | 1972-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-01 | 1975-07-03 | 1976-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-01 | 1979-07-03 | 1980-01-02 | $7700.00 | Window Closed / Lapsed |