US2429222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making contact wires
Assignee: AT&T Inc
•
Filing: 1943-06-05
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Granted: 1947-10-21
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Expires: 1963-06-05
Abstract
No abstract record available.
Inventors
- 👤 Robert A Ehrhardt
- 👤 Robert G Humphrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:54
CPC Classifications
H; H10; H10P; H10P95/00; H10D; H10D64/00; H10D64/20; H10D64/23; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/929; Y10S428/9335; Y10S428/934; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49204; Y10T29/49224; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12889
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190822455A
Cited
US1745912A
Cited
US2091554A
Cited
GB493518A
Cited
US2115749A
Cited
US2219738A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-20 | 1951-04-21 | 1951-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-20 | 1955-04-21 | 1955-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-20 | 1959-04-21 | 1959-10-21 | $7700.00 | Window Closed / Lapsed |