US2568172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current supply apparatus
Assignee: AT&T Inc
•
Filing: 1950-04-20
•
Granted: 1951-09-18
•
Expires: 1970-04-20
Abstract
No abstract record available.
Inventors
- 👤 Harry H Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:33
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/32; G05F1/34; Y; Y10; Y10S; Y10S320/00; Y10S320/18; Y10S320/19; Y10S320/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US860305A
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US1231991A
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US1574747A
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US1681265A
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US1702724A
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US2155515A
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US2368638A
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US2326313A
Cited
US2366505A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-17 | 1955-03-19 | 1955-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-17 | 1959-03-19 | 1959-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-17 | 1963-03-19 | 1963-09-18 | $7700.00 | Window Closed / Lapsed |