US3437813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pattern tracing apparatus employing crossline detection circuits to control auxiliary functions
Assignee: SEM Corp
•
Filing: 1967-03-03
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Granted: 1969-04-08
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Expires: 1987-03-03
Abstract
No abstract record available.
Inventors
- 👤 Robert H Eisengrein
- 👤 Francis O Blackwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:54
CPC Classifications
B; B23; B23Q; B23Q35/00; B23Q35/04; B23Q35/08; B23Q35/12; B23Q35/127; B23Q35/128; G; G05; G05B; G05B2219/00; G05B2219/30; G05B2219/47; G05B2219/4708; Y; Y02; Y02P; Y02P70/00; Y02P70/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2999938A
Cited
US3369123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |