US2441255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Counterbalance
Assignee: Emsco Derrick and Equipment Co
•
Filing: 1945-01-22
•
Granted: 1948-05-11
•
Expires: 1965-01-22
Abstract
No abstract record available.
Inventors
- 👤 Albert A Ashton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:19
CPC Classifications
F; F16; F16F; F16F15/00; F16F15/28; F16F15/283; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2142; Y10T74/2154; Y10T74/2156; Y10T74/2157
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2081141A
Cited
US1775390A
Cited
US1956158A
Cited
US2123676A
Cited
US2213646A
Cited
US2218967A
Cited
US2270843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-11 | 1951-11-10 | 1952-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-11 | 1955-11-10 | 1956-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-11 | 1959-11-10 | 1960-05-11 | $7700.00 | Window Closed / Lapsed |