US2550720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
richardson
Assignee: —
•
Filing: —
•
Granted: 1951-05-01
•
Expires: 1968-05-01
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:15
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/04; G01R13/14; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G02B26/105; H; H02; H02K; H02K33/00; H02K33/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1702650A
Cited
US1981266A
Cited
US2389081A
Cited
US813269A
Cited
US2149442A
Cited
US2268526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |