US2807755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purge unit
Assignee: ARNOLD O BECKMAN Inc
•
Filing: 1953-01-06
•
Granted: 1957-09-24
•
Expires: 1973-01-06
Abstract
No abstract record available.
Inventors
- 👤 Louis C Thayer
- 👤 Alfred D Robinson
- 👤 Robert A Crane
- 👤 Jr Joseph W Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:11
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/02; H01H9/04; H01H9/042; H01H9/046
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1670697A
Cited
US1819245A
Cited
US1899746A
Cited
US2089988A
Cited
US2169867A
Cited
US2240922A
Cited
US2467181A
Cited
US2511631A
Cited
US2724581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |