Patent US3478472A successfully refreshed from Google Patents.
US3478472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for constant pressurization of inflatable and other enclosures
Assignee: Individual
•
Filing: 1967-11-29
•
Granted: 1969-11-18
•
Expires: 1987-11-29
Abstract
No abstract record available.
Inventors
- 👤 John P Kwake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:00
CPC Classifications
E; E04; E04H; E04H15/00; E04H15/20; E04H15/22
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |