US2874822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storage system
Assignee: Individual
•
Filing: 1957-01-31
•
Granted: 1959-02-24
•
Expires: 1977-01-31
Abstract
No abstract record available.
Inventors
- 👤 Ralph W Coursey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:03
CPC Classifications
E; E04; E04H; E04H6/00; E04H6/08; E04H6/12; E04H6/18; E04H6/187
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1458881A
Cited
US1815738A
Cited
US1837605A
Cited
US1646259A
Cited
GB464013A
Cited
US2260528A
Cited
US2268862A
Cited
CH260397A
Cited
US2645367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |