Patent US3473973A successfully refreshed from Google Patents.
US3473973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of treating stainless steels
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1966-05-11
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Granted: 1969-10-21
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Expires: 1986-05-11
Abstract
No abstract record available.
Inventors
- 👤 Tatsuo Maekawa
- 👤 Nobuo Nakajima
- 👤 Masaru Kagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:35
CPC Classifications
C; C21; C21D; C21D8/00; C22; C22C; C22C38/00; C22C38/18; C22C38/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |