US2775712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase comparison system
Assignee: Individual
•
Filing: 1951-07-26
•
Granted: 1956-12-25
•
Expires: 1971-07-26
Abstract
No abstract record available.
Inventors
- 👤 Alan M Maccallum
- 👤 Corles M Perkins
- 👤 Bennett Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:34
CPC Classifications
G; G05; G05B; G05B1/00; G05B1/01; G05B1/02; G05B1/025; F; F41; F41G; F41G7/00; F41G7/20; F41G7/30; F41G7/301
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1705993A
Cited
US2561329A
Cited
US2411916A
Cited
US2429216A
Cited
US2453624A
Cited
US2697808A
Cited
US2467347A
Cited
US2565621A
Cited
US2640939A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |