US2954897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety pressure relief device
Assignee: Black Sivalls and Bryson Inc
•
Filing: 1956-02-15
•
Granted: 1960-10-04
•
Expires: 1976-02-15
Abstract
No abstract record available.
Inventors
- 👤 Franklin A Hansen
- 👤 Robert S Coffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:20
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/14; F16K17/16; F16K17/162
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2198988A
Cited
US2224748A
Cited
US2178178A
Cited
US2263840A
Cited
GB578008A
Cited
US2523068A
Cited
US2548744A
Cited
DE851152C
Cited
US2766904A
Cited
US2758749A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-04 | 1964-04-04 | 1964-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-04 | 1968-04-04 | 1968-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-04 | 1972-04-04 | 1972-10-04 | $7700.00 | Window Closed / Lapsed |