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Patent US3538633A successfully refreshed from Google Patents.
US3538633A
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Assignee: FREDERICK H ELLIOTT JR
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Filing: 1968-04-15
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Granted: 1970-11-10
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Expires: 1988-04-15
Abstract
No abstract record available.
Inventors
- 👤 Frederick H Elliott Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:56
CPC Classifications
G; G09; G09F; G09F21/00; G09F21/04; E; E01; E01F; E01F9/00; E01F9/60; E01F9/658; E01F9/662; G09F11/00; G09F11/24
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) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |