US2769227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welded joint between ferritic and austenitic steel members
Assignee: Thos Firth & John Brown Ltd
•
Filing: 1951-11-28
•
Granted: 1956-11-06
•
Expires: 1971-11-28
Abstract
No abstract record available.
Inventors
- 👤 Sykes Charles
- 👤 Kirkby Henry William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:26
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3053; B23K35/3066; B23K35/001; B23K35/004; Y; Y10; Y10S; Y10S285/00; Y10S285/905; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/939; Y10T; Y10T403/00; Y10T403/21; Y10T403/213; Y10T428/00; Y10T428/12; Y10T428/12458; Y10T428/12493; Y10T428/125; Y10T428/12507; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12958; Y10T428/12965; Y10T428/12986
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |