Patent US3475232A successfully refreshed from Google Patents.
US3475232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of quenching
Assignee: EF Houghton and Co
•
Filing: 1966-11-23
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Granted: 1969-10-28
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Expires: 1986-11-23
Abstract
No abstract record available.
Inventors
- 👤 Marvin Lewis
- 👤 Paul J Welsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:28
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/56; C21D1/60
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) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |