US2789581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reserve pressure cylinder
Assignee: Individual
•
Filing: 1954-08-27
•
Granted: 1957-04-23
•
Expires: 1974-08-27
Abstract
No abstract record available.
Inventors
- 👤 Ralph W Kerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:54
CPC Classifications
F; F15; F15B; F15B1/00; F15B1/02; F15B1/04; F15B2201/00; F15B2201/20; F15B2201/205; F15B2201/21; F15B2201/30; F15B2201/31; F15B2201/312; F15B2201/32; F15B2201/40; F15B2201/41; F15B2201/411; F15B2201/413
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE110377C
Cited
DE87187C
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US912502A
Cited
US2137384A
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US2170890A
Cited
US2365994A
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US2540031A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |