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US2487626A
Expired / Lapsed
US
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Sectional heater
Assignee: Individual
•
Filing: 1945-04-21
•
Granted: 1949-11-08
•
Expires: 1965-04-21
Abstract
No abstract record available.
Inventors
- 👤 Richard C Wittman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:58
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/04; Y; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/067; Y10S165/068
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US394899A
Cited
US649744A
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US1076838A
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US1683393A
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US1757327A
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GB328066A
Cited
US1989340A
Cited
US2101782A
Cited
US2270060A
Cited
US2281594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-07 | 1953-05-09 | 1953-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-07 | 1957-05-09 | 1957-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-07 | 1961-05-09 | 1961-11-08 | $7700.00 | Window Closed / Lapsed |