Patent US2033702A successfully refreshed from Google Patents.
US2033702A
Expired / Lapsed
US
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Heat storage and transfer agent
Assignee: Dow Chemical Co
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Filing: 1934-06-07
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Granted: 1936-03-10
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Expires: 1954-06-07
Abstract
No abstract record available.
Inventors
- 👤 John J Grebe
- 👤 Sylvia M Stoesser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:26
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/08
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) | 1939-03-10 | 1939-09-09 | 1940-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-03-10 | 1943-09-09 | 1944-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-03-10 | 1947-09-09 | 1948-03-10 | $7700.00 | Window Closed / Lapsed |