US2545903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler
Assignee: Individual
•
Filing: 1945-08-30
•
Granted: 1951-03-20
•
Expires: 1965-08-30
Abstract
No abstract record available.
Inventors
- 👤 Swendsen David Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:48
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/22; F24H1/38; F24H1/24; F24H1/26; F24H1/44; Y; Y10; Y10S; Y10S122/00; Y10S122/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US573912A
Cited
US1564176A
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US748374A
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US954855A
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FR437826A
Cited
US1620672A
Cited
DE399558C
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US1620111A
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US1770588A
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US1980755A
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US2210329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-19 | 1954-09-18 | 1955-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-19 | 1958-09-18 | 1959-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-19 | 1962-09-18 | 1963-03-20 | $7700.00 | Window Closed / Lapsed |