US2861386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drafting board with flexible displaceable cover
Assignee: Hamilton Manufacturing Co
•
Filing: 1957-10-07
•
Granted: 1958-11-25
•
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 08:16
CPC Classifications
B; B43; B43L; B43L5/00; A; A47; A47B; A47B97/00; A47B2200/00; A47B2200/0001; A47B2200/0006
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US551003A
Cited
US756040A
Cited
US1210004A
Cited
US1689890A
Cited
US1911779A
Cited
US2163985A
Cited
US2327963A
Cited
US2439027A
Cited
US2626846A
Cited
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 |