US3408237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ductile case-hardened steels
Assignee: International Business Machines Corp
•
Filing: 1967-03-16
•
Granted: 1968-10-29
•
Expires: 1987-03-16
Abstract
No abstract record available.
Inventors
- 👤 John T Gulliksen
- 👤 Alfred E Oldaker
- 👤 Frank J Bolda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:17
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/04; C25; C25D; C25D5/00; C25D5/02; Y; Y10; Y10S; Y10S148/00; Y10S148/902
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US728217A
Cited
US1072660A
Cited
US1759690A
Cited
US3122817A
Cited
US3184823A
Cited
US3193418A
Cited
US3231421A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |