Patent US3421147A successfully refreshed from Google Patents.
US3421147A
Expired / Lapsed
US
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Buffer arrangement
Assignee: AT&T Inc
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Filing: 1965-05-07
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Granted: 1969-01-07
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Expires: 1985-05-07
Abstract
No abstract record available.
Inventors
- 👤 Herbert O Burton
- 👤 Lorin P Mcrae
- 👤 William J Wolf Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:34
CPC Classifications
H; H04; H04L; H04L13/00; H04L13/02; H04L13/08; G; G11; G11B; G11B20/00; G11B20/10; G11B20/10527; G11B2020/1062; G11B2020/10675; G11B2020/10694; G11B2020/10703
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) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |