US2923997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
emmerling
Assignee: Sparco Operating Inc
•
Filing: —
•
Granted: 1960-02-09
•
Expires: 1977-02-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:54
CPC Classifications
F; F27; F27D; F27D5/00; F27D5/0006; F27D5/0012
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2733497A
Cited
US984593A
Cited
US1273397A
Cited
US1841641A
Cited
US1802245A
Cited
US1969126A
Cited
US2118641A
Cited
US2246448A
Cited
US2297286A
Cited
GB636515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-08 | 1963-08-10 | 1964-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-08 | 1967-08-10 | 1968-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-08 | 1971-08-10 | 1972-02-09 | $7700.00 | Window Closed / Lapsed |