US2521475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Freezing section
Assignee: Individual
•
Filing: 1948-04-15
•
Granted: 1950-09-05
•
Expires: 1968-04-15
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Nickolas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:03
CPC Classifications
F; F25; F25C; F25C3/00; F25C3/02; F25B; F25B39/00; F25B39/02; F28; F28F; F28F1/00; F28F1/02; F28F1/04; F28F1/045; F28F9/00; F28F9/02; F28F9/04; F28F9/16; F28F9/18; F28F9/182
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB159933A
Cited
US1775819A
Cited
US2206286A
Cited
US2179703A
Cited
US2270745A
Cited
US2436390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |