Patent US2702500A successfully refreshed from Google Patents.
US2702500A
Expired / Lapsed
US
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Direct action magnetic shutter
Assignee: Individual
•
Filing: 1952-03-20
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Granted: 1955-02-22
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Expires: 1972-03-20
Abstract
No abstract record available.
Inventors
- 👤 Bell Arthur G De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:43
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US562599A
Cited
US660006A
Cited
US1919115A
Cited
US1913182A
Cited
US1934519A
Cited
US1983898A
Cited
US2105475A
Cited
US2390216A
Cited
US2528510A
Cited
US2572229A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-21 | 1958-08-23 | 1959-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-21 | 1962-08-23 | 1963-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-21 | 1966-08-23 | 1967-02-22 | $7700.00 | Window Closed / Lapsed |