US2876547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perspective drawing kit
Assignee: Northrop Grumman Corp
•
Filing: 1953-07-13
•
Granted: 1959-03-10
•
Expires: 1973-07-13
Abstract
No abstract record available.
Inventors
- 👤 Spencer C Richard
- 👤 Michael J Nagy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:58
CPC Classifications
B; B43; B43L; B43L13/00; B43L13/14; B43L13/141; B43L13/142
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US21336A
Cited
US312175A
Cited
US482127A
Cited
US2412194A
Cited
US1591380A
Cited
GB208211A
Cited
US1969758A
Cited
US2388402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-09 | 1962-09-08 | 1963-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-09 | 1966-09-08 | 1967-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-09 | 1970-09-08 | 1971-03-10 | $7700.00 | Window Closed / Lapsed |