US2444880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical seal
Assignee: Sprague Electric Co
•
Filing: 1943-12-23
•
Granted: 1948-07-06
•
Expires: 1963-12-23
Abstract
No abstract record available.
Inventors
- 👤 Robinson Preston
- 👤 Paul H Netherwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:15
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/224; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49169
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1693365A
Cited
GB284897A
Cited
GB329215A
Cited
US2017204A
Cited
US2197357A
Cited
US2222748A
Cited
US2243881A
Cited
US2229291A
Cited
US2199803A
Cited
US2256897A
Cited
US2325105A
Cited
US2328825A
Cited
US2365926A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-06 | 1952-01-05 | 1952-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-06 | 1956-01-05 | 1956-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-06 | 1960-01-05 | 1960-07-06 | $7700.00 | Window Closed / Lapsed |