US2654584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas cooling contact apparatus
Assignee: Research Corp
•
Filing: 1950-09-29
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Granted: 1953-10-06
•
Expires: 1970-09-29
Abstract
No abstract record available.
Inventors
- 👤 Carl W J Hedberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:39
CPC Classifications
F; F28; F28C; F28C3/00; F28C3/06; B; B03; B03C; B03C3/00; B03C3/01; B03C3/014
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US441106A
Cited
US1037095A
Cited
US1569860A
Cited
US1747610A
Cited
US1844850A
Cited
US1820726A
Cited
US2031437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-05 | 1957-04-06 | 1957-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-05 | 1961-04-06 | 1961-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-05 | 1965-04-06 | 1965-10-06 | $7700.00 | Window Closed / Lapsed |