Patent DE828270C successfully refreshed from Google Patents.
US2928538A
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US
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Assignee: Individual
•
Filing: 1957-05-31
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Granted: 1960-03-15
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Expires: 1977-05-31
Abstract
No abstract record available.
Inventors
- 👤 Charles W Mills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:58
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/66; G11B15/67; G11B15/674; G03; G03B; G03B21/00; G03B21/14; G03B21/32; G03B21/321; G03B21/328
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB191018867A
Cited
US1229312A
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US1274344A
Cited
US1338612A
Cited
US1478896A
Cited
US1468636A
Cited
US2310156A
Cited
DE866602C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |