US2020117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutting, grinding, and burnishing tool and the production thereof
Assignee: CALIBRON PRODUCTS Inc
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Filing: 1930-05-21
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Granted: 1935-11-05
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Expires: 1950-05-21
Abstract
No abstract record available.
Inventors
- 👤 Albert E Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:29
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; B; B24; B24D; B24D18/00; B24D18/0018; B24D7/00; B24D7/02; Y; Y10; Y10S; Y10S204/00; Y10S204/07; Y10S76/00; Y10S76/05; Y10T; Y10T407/00; Y10T407/19; Y10T407/1952; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12625; Y10T428/29; Y10T428/2982; Y10T428/2991
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) | 1938-11-04 | 1939-05-06 | 1939-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-11-04 | 1943-05-06 | 1943-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-11-04 | 1947-05-06 | 1947-11-05 | $7700.00 | Window Closed / Lapsed |