US2981004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Draftsman's perspective instrument
Assignee: Individual
•
Filing: 1959-03-16
•
Granted: 1961-04-25
•
Expires: 1979-03-16
Abstract
No abstract record available.
Inventors
- 👤 George E Edlund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:16
CPC Classifications
B; B43; B43L; B43L13/00; B43L13/14; B43L13/141; B43L13/145
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US618135A
Cited
US2734274A
Cited
US934260A
Cited
US1241282A
Cited
US1348655A
Cited
GB591691A
Cited
US2651111A
Cited
CH299393A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |