US2796052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler construction
Assignee: Petro-Chem Process Co Inc
•
Filing: 1954-03-29
•
Granted: 1957-06-18
•
Expires: 1974-03-29
Abstract
No abstract record available.
Inventors
- 👤 John W Throckmorton
- 👤 John S Wallis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:56
CPC Classifications
C; C10; C10G; C10G9/00; C10G9/14; C10G9/18; C10G9/20; F; F22; F22B; F22B21/00; F22B21/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US482384A
Cited
US545386A
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US1126685A
Cited
US1009275A
Cited
US2271880A
Cited
US2375505A
Cited
US2630104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-17 | 1960-12-17 | 1961-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-17 | 1964-12-17 | 1965-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-17 | 1968-12-17 | 1969-06-18 | $7700.00 | Window Closed / Lapsed |