Patent US3434471A successfully refreshed from Google Patents.
US3434471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Therapeutic intermittent positive pressure respirator
Assignee: SmithKline Beecham Corp
•
Filing: 1966-04-06
•
Granted: 1969-03-25
•
Expires: 1986-04-06
Abstract
No abstract record available.
Inventors
- 👤 Max D Liston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:43
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/021; A61M16/10; A61M16/14; A61M16/16; A61M16/20; A61M16/201; A61M16/207; A61M16/208; A61M16/209; Y; Y10; Y10S; Y10S261/00; Y10S261/65
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1950577A
Cited
US2121311A
Cited
US2547458A
Cited
US3075523A
Cited
US3068856A
Cited
US3171411A
Cited
US3097638A
Cited
US3267935A
Cited
US3307542A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |