Patent US1997228A successfully refreshed from Google Patents.
US1997228A
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Conjugate curve generator
Assignee: Individual
•
Filing: 1932-07-22
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Granted: 1935-04-09
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Expires: 1952-07-22
Abstract
No abstract record available.
Inventors
- 👤 William H Nichols
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:45
CPC Classifications
B; B23; B23Q; B23Q27/00; B23Q27/006; B23F; B23F15/00; B23F15/08; Y; Y10; Y10S; Y10S451/00; Y10S451/90; Y10T; Y10T409/00; Y10T409/10; Y10T409/107791; Y10T409/108109; Y10T409/108745; Y10T74/00; Y10T74/19; Y10T74/19949; Y10T74/19963; Y10T74/19972
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) | 1938-04-08 | 1938-10-08 | 1939-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-04-08 | 1942-10-08 | 1943-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-04-08 | 1946-10-08 | 1947-04-09 | $7700.00 | Window Closed / Lapsed |