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US2977428A
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Assignee: Individual
•
Filing: 1960-01-29
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Granted: 1961-03-28
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Expires: 1980-01-29
Abstract
No abstract record available.
Inventors
- 👤 Albert E Showalter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:59
CPC Classifications
H; H03; H03J; H03J5/00; H03J5/24; H03J5/26; H03J5/32; H01; H01H; H01H13/00; H01H13/70; H01H13/72; H01H13/74; H01H9/00; H01H9/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2650027A
Cited
US2934613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |