Patent US3755557A successfully refreshed from Google Patents.
US3755557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spray vaccines
Assignee: US Philips Corp
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Filing: 1971-08-27
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Granted: 1973-08-28
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Expires: 1991-08-27
Abstract
Abstract THE INVENTION RELATES TO SPRAY VACCINES IN WHICH THE ANTIGEN MATERIAL IN A DRY FORM IS DISPERSED IN A LIQUID PROPELLANT. THE DISPERSING AGENT USED IS NOT A LIQUID AND AT THE SAME TIME NON-IONIC COMPOUND, BUT LECITHIN WHICH IS SOLID AND IONIC.
Inventors
- 👤 J Jacobs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:38
CPC Classifications
A; A61; A61K; A61K39/00; A61K39/02; A61K39/095
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |