US1675644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Age-hardening process
Assignee: AT&T Inc
•
Filing: 1924-09-16
•
Granted: 1928-07-03
•
Expires: 1944-09-16
Abstract
No abstract record available.
Inventors
- 👤 Dean Reginald Scott
- 👤 Hudson William Ewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:41
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/12; Y; Y10; Y10S; Y10S164/00; Y10S164/01
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) | 1931-07-03 | 1932-01-02 | 1932-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-07-03 | 1936-01-02 | 1936-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-07-03 | 1940-01-02 | 1940-07-03 | $7700.00 | Window Closed / Lapsed |