US3429973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace construction
Assignee: FREDERICK H N CARTER
•
Filing: 1965-09-02
•
Granted: 1969-02-25
•
Expires: 1985-09-02
Abstract
No abstract record available.
Inventors
- 👤 Frederick H N Carter
- 👤 William V Martinson
- 👤 Sven M J Olsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:05
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/18; F27D1/1808; F27D1/1816; F27B; F27B3/00; F27B3/10; F27B3/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1552143A
Cited
US2215532A
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US2222004A
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US2548485A
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US2648714A
Cited
US2766736A
Cited
US2871533A
Cited
US3247829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |