Patent US3438558A successfully refreshed from Google Patents.
US3438558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape drive arrangement with selfaligning pressure roller
Assignee: V M Corp
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Filing: 1967-01-20
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Granted: 1969-04-15
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Expires: 1987-01-20
Abstract
No abstract record available.
Inventors
- 👤 Robert J Hammond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:57
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/26; G11B15/28; G11B15/29
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2788209A
Cited
US2988257A
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US3248066A
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US3107835A
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US3136464A
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US3164331A
Cited
US3269626A
Cited
US3233807A
Cited
US3298583A
Cited
US3339816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |