US3532333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for and method of case-hardening an arcuate member
Assignee: OILWELL Inc A CORP OF
•
Filing: 1967-12-21
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Granted: 1970-10-06
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Expires: 1987-12-21
Abstract
No abstract record available.
Inventors
- 👤 Edward H Dehn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:37
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/06; C21D1/09; C21D1/10; H; H05; H05B; H05B6/00; H05B6/02; H05B6/06; H05B6/10; H05B6/101; H05B6/102; H05B6/36; H05B6/42; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB225333A
Cited
US2085790A
Cited
US2414362A
Cited
US2424816A
Cited
US2477029A
Cited
US2512893A
Cited
US2882191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-05 | 1974-04-06 | 1974-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-05 | 1978-04-06 | 1978-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-05 | 1982-04-06 | 1982-10-06 | $7700.00 | Window Closed / Lapsed |