US2978237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat treating apparatus
Assignee: Basic Products Corp
•
Filing: 1956-09-20
•
Granted: 1961-04-04
•
Expires: 1976-09-20
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:26
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/74
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1205690A
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US1761199A
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US1969708A
Cited
US2010295A
Cited
GB493184A
Cited
US2622861A
Cited
US2713480A
Cited
US2875995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |