Patent US2140735A successfully refreshed from Google Patents.
US2140735A
Expired / Lapsed
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Viscosity regulator
Assignee: HENRY R GROSS
•
Filing: 1935-04-13
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Granted: 1938-12-20
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Expires: 1955-04-13
Abstract
No abstract record available.
Inventors
- 👤 Henry B Clarke
- 👤 Harry T Booth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:57
CPC Classifications
F; F16; F16N; F16N39/00; A; A61; A61B; A61B17/00; A61B2017/0046; A61B2017/00464; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2499; Y10T137/2506; Y10T137/8593; Y10T137/86493; Y10T137/86879
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) | 1941-12-19 | 1942-06-20 | 1942-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-12-19 | 1946-06-20 | 1946-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-12-19 | 1950-06-20 | 1950-12-20 | $7700.00 | Window Closed / Lapsed |