US2181784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scaffold
Assignee: National Tube Co
•
Filing: 1938-02-04
•
Granted: 1939-11-28
•
Expires: 1958-02-04
Abstract
No abstract record available.
Inventors
- 👤 Thomas M Dugan
- 👤 Marton Anthony Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:45
CPC Classifications
E; E04; E04G; E04G1/00; E04G1/02; E04G1/04; E04G1/06; Y; Y10; Y10T; Y10T403/00; Y10T403/30
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-11-27 | 1943-05-29 | 1943-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-11-27 | 1947-05-29 | 1947-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-11-27 | 1951-05-29 | 1951-11-28 | $7700.00 | Window Closed / Lapsed |