Patent US3669656A successfully refreshed from Google Patents.
US3669656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tungsten base welding rod,method for making same and novel applications of same
Assignee: Duracell Inc USA
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Filing: 1970-05-11
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Granted: 1972-06-13
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Expires: 1990-05-11
Abstract
Abstract TUNGSTEN BASE WELD ROD ALLOY CONTAINS 40 TO 80% BY WEIGHT TUNGSTEN; 5 TO 40% NICKEL AND 1 TO 25% IRON.
Inventors
- 👤 Peter C Murphy
- 👤 J Richard Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:07
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |