US2828530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: AT&T Inc
•
Filing: 1955-09-27
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Granted: 1958-04-01
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Expires: 1975-09-27
Abstract
No abstract record available.
Inventors
- 👤 Sidney S Charschan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:14
CPC Classifications
B; B29; B29C; B29C37/00; B29C37/02; B23; B23D; B23D79/00; Y; Y10; Y10S; Y10S425/00; Y10S425/806; Y10T; Y10T225/00; Y10T225/30; Y10T225/371; Y10T29/00; Y10T29/47; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/4913
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US658337A
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US834457A
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US935247A
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US983018A
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US2301655A
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US2357515A
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US2390651A
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US2431654A
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US2473654A
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US2541455A
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US2493039A
Cited
US2704011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |