Patent US2284761A successfully refreshed from Google Patents.
US3266489A
Expired / Lapsed
US
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Breathing apparatus
Assignee: Vickers Research Ltd
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Filing: 1963-05-17
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Granted: 1966-08-16
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Expires: 1983-05-17
Abstract
No abstract record available.
Inventors
- 👤 Williams Kenneth Gabriel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:49
CPC Classifications
A; A62; A62B; A62B7/00; A62B7/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-15 | 1970-02-14 | 1970-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-15 | 1974-02-14 | 1974-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-15 | 1978-02-14 | 1978-08-16 | $7700.00 | Window Closed / Lapsed |