US2017653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Velocity comparing system for film driving apparatus
Assignee: AT&T Inc
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Filing: 1933-04-06
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Granted: 1935-10-15
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Expires: 1953-04-06
Abstract
No abstract record available.
Inventors
- 👤 Carole A Clarke
- 👤 Lloyd A Elmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:13
CPC Classifications
G; G03; G03B; G03B31/00; G03B31/02
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) | 1938-10-14 | 1939-04-15 | 1939-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-10-14 | 1943-04-15 | 1943-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-10-14 | 1947-04-15 | 1947-10-15 | $7700.00 | Window Closed / Lapsed |