Patent US4355429A successfully refreshed from Google Patents.
Patent US1783844A successfully refreshed from Google Patents.
US1783844A
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Heat-transfer apparatus
Assignee: Pfaudler Inc
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Filing: 1928-03-13
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Granted: 1930-12-02
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Expires: 1948-03-13
Abstract
No abstract record available.
Inventors
- 👤 Jens N Jacobsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:39
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/026; F28D; F28D7/00; F28D7/16; F28D7/163; F28D7/1653; F28F13/00; F28F13/06; F28F13/12; F28F9/0202; Y; Y10; Y10S; Y10S165/00; Y10S165/072
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) | 1933-12-01 | 1934-06-02 | 1934-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-12-01 | 1938-06-02 | 1938-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-12-01 | 1942-06-02 | 1942-12-02 | $7700.00 | Window Closed / Lapsed |