Patent US3423189A successfully refreshed from Google Patents.
US3423189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zone melting
Assignee: AT&T Inc
•
Filing: 1966-01-13
•
Granted: 1969-01-21
•
Expires: 1986-01-13
Abstract
No abstract record available.
Inventors
- 👤 William G Pfann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:43
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/16; C30B13/28; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1076; Y10T117/1088
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2823102A
Cited
US2998335A
Cited
US2967095A
Cited
US3139653A
Cited
US3124633A
Cited
US3189419A
Cited
US3258314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |