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US3438652A
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Assignee: DON L HOFFACKER
•
Filing: 1967-01-25
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Granted: 1969-04-15
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Expires: 1987-01-25
Abstract
No abstract record available.
Inventors
- 👤 Don L Hoffacker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:46
CPC Classifications
B; B60; B60P; B60P3/00; B60P3/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1544448A
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US2116412A
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US2376296A
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GB620378A
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FR1019234A
Cited
GB778055A
Cited
US2789714A
Cited
US2772892A
Cited
US2919928A
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US3339942A
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 |