US2821975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fireplace construction
Assignee: Individual
•
Filing: 1954-12-31
•
Granted: 1958-02-04
•
Expires: 1974-12-31
Abstract
No abstract record available.
Inventors
- 👤 Robert K Thulman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:14
CPC Classifications
F; F24; F24B; F24B1/00; F24B1/18; F24B1/185; F24B1/188; F24B1/1885; F24B1/189; F24B1/19; F24B1/1902
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US289634A
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US329224A
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US411459A
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US474655A
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US2361643A
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US976039A
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US926910A
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US1588587A
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GB565194A
Cited
US2642859A
Cited
US2703567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-03 | 1961-08-05 | 1962-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-03 | 1965-08-05 | 1966-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-03 | 1969-08-05 | 1970-02-04 | $7700.00 | Window Closed / Lapsed |