US3003243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined pencil trough, instrument guard and drafting machine track for drawing board
Assignee: Hamilton Manufacturing Co
•
Filing: 1958-02-06
•
Granted: 1961-10-10
•
Expires: 1978-02-06
Abstract
No abstract record available.
Inventors
- 👤 Claude G Kanzelberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:07
CPC Classifications
B; B43; B43M; B43M99/00; B43L; B43L13/00; B43L13/02; B43L13/04; B43L13/045; A; A47; A47B; 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)
BE510529A
Cited
US308774A
Cited
US694389A
Cited
US707165A
Cited
US2564386A
Cited
US2673600A
Cited
GB754445A
Cited
US2847731A
Cited
US2861386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-09 | 1965-04-10 | 1965-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-09 | 1969-04-10 | 1969-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-09 | 1973-04-10 | 1973-10-10 | $7700.00 | Window Closed / Lapsed |