Patent US2861386A successfully refreshed from Google Patents.
US2861386A
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US
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Drafting board with flexible displaceable cover
Assignee: Hamilton Manufacturing Co
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Filing: 1957-10-07
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Granted: 1958-11-25
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Expires: 1977-10-07
Abstract
No abstract record available.
Inventors
- 👤 Paul L Paulsen
- 👤 Charles W Altmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:42
CPC Classifications
B; B43; B43L; B43L5/00; A; A47; A47B; A47B97/00; A47B2200/00; A47B2200/0001; A47B2200/0006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US756040A
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US1210004A
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US1689890A
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US1911779A
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US2163985A
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US2327963A
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US2439027A
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US2626846A
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US2562360A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |