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US3456781A
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Assignee: BERNARD G BRADBURY
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Filing: 1967-09-14
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Granted: 1969-07-22
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Expires: 1987-09-14
Abstract
No abstract record available.
Inventors
- 👤 Bernard G Bradbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:06
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/027; G03; G03B; G03B21/00; G03B21/14; G03B21/32; G03B21/321; G03B21/323
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1395323A
Cited
GB428819A
Cited
US2509841A
Cited
US3107783A
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US3338464A
Cited
US3340997A
Cited
US3381916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |