US1975937A
Expired / Lapsed
US
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Method of and apparatus for regulating the viscosity of liquids
Assignee: Peabody Engineering Corp
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Filing: 1929-10-01
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Granted: 1934-10-09
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Expires: 1949-10-01
Abstract
No abstract record available.
Inventors
- 👤 David P Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:35
CPC Classifications
F; F23; F23D; F23D11/00; F23D11/36; F23D11/44; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391; Y10T137/2496; Y10T137/2499; Y10T137/2506; Y10T137/2514; Y10T137/2521; Y10T137/6416; Y10T137/6579; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7787; Y10T137/7788; Y10T137/8158; Y10T137/8175
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) | 1937-10-08 | 1938-04-09 | 1938-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-10-08 | 1942-04-09 | 1942-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-10-08 | 1946-04-09 | 1946-10-09 | $7700.00 | Window Closed / Lapsed |