US2381941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frictional apparatus
Assignee: SK Wellman Corp
•
Filing: 1942-05-19
•
Granted: 1945-08-14
•
Expires: 1962-05-19
Abstract
No abstract record available.
Inventors
- 👤 Samuel K Wellman
- 👤 Charles B Sawyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:08
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/02; F16D65/12; F16D65/125; F16D55/00; F16D55/02; F16D55/04; F16D55/06; F16D55/24; F16D55/26; F16D55/36; F16D55/40; F16D65/10; F16D69/00; F16D69/02; F16D69/027; F16D2055/0004; F16D2055/0058; F16D2065/13; F16D2065/1304; F16D2065/132; F16D2069/002; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12069; Y10T428/12076; Y10T428/1209
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) | 1948-08-13 | 1949-02-12 | 1949-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-08-13 | 1953-02-12 | 1953-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-08-13 | 1957-02-12 | 1957-08-14 | $7700.00 | Window Closed / Lapsed |