Patent US2234222A successfully refreshed from Google Patents.
US2234222A
Expired / Lapsed
US
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Boiler tube shield
Assignee: Individual
•
Filing: 1939-10-28
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Granted: 1941-03-11
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Expires: 1959-10-28
Abstract
No abstract record available.
Inventors
- 👤 Eugene A Baerer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:07
CPC Classifications
F; F28; F28G; F28G3/00; F28G3/16; F28G3/166; Y; Y10; Y10T; Y10T24/00; Y10T24/44; Y10T24/44239
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-03-10 | 1944-09-09 | 1945-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-03-10 | 1948-09-09 | 1949-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-03-10 | 1952-09-09 | 1953-03-11 | $7700.00 | Window Closed / Lapsed |