US2455520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature controlled test system
Assignee: AT&T Inc
•
Filing: 1944-03-24
•
Granted: 1948-12-07
•
Expires: 1964-03-24
Abstract
No abstract record available.
Inventors
- 👤 Glenn L Prudhon
- 👤 Russell W Spikula
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:51
CPC Classifications
G; G01; G01N; G01N25/00; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/1909; G05D23/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1775540A
Cited
US1831151A
Cited
US2058846A
Cited
US2178225A
Cited
US2285118A
Cited
US2300537A
Cited
US2340837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-07 | 1952-06-07 | 1952-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-07 | 1956-06-07 | 1956-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-07 | 1960-06-07 | 1960-12-07 | $7700.00 | Window Closed / Lapsed |