US2820294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drawing instrument
Assignee: Individual
•
Filing: 1953-11-24
•
Granted: 1958-01-21
•
Expires: 1973-11-24
Abstract
No abstract record available.
Inventors
- 👤 Gregory S Dolgorukov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:42
CPC Classifications
B; B43; B43L; B43L7/00; B43L7/027; B43L7/0275; B43L13/00; B43L13/02; B43L13/028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US808511A
Cited
DE422553C
Cited
US1704540A
Cited
DE580055C
Cited
US2043729A
Cited
US2010198A
Cited
US2676410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |