US2437994A
Expired / Lapsed
US
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Assignee: AT&T Inc
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Filing: 1946-03-05
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Granted: 1948-03-16
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Expires: 1966-03-05
Abstract
No abstract record available.
Inventors
- 👤 Charles M Beyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:07
CPC Classifications
B; B28; B28D; B28D1/00; B28D1/32; B28D1/322; Y; Y10; Y10T; Y10T83/00; Y10T83/202; Y10T83/2092; Y10T83/2183; Y10T83/219; Y10T83/444; Y10T83/4622; Y10T83/4625; Y10T83/647; Y10T83/654; Y10T83/6545; Y10T83/6547; Y10T83/6548; Y10T83/655; Y10T83/6563; Y10T83/6566
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-16 | 1951-09-15 | 1952-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-16 | 1955-09-15 | 1956-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-16 | 1959-09-15 | 1960-03-16 | $7700.00 | Window Closed / Lapsed |