US3023688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air barrier
Assignee: Individual
•
Filing: 1958-05-16
•
Granted: 1962-03-06
•
Expires: 1978-05-16
Abstract
No abstract record available.
Inventors
- 👤 Jr Fred A Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:15
CPC Classifications
F; F24; F24F; F24F9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US983877A
Cited
US1279993A
Cited
US1750794A
Cited
US2565933A
Cited
US2593702A
Cited
CH307257A
Cited
US2863373A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-03-05 | 1965-09-04 | 1966-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-05 | 1969-09-04 | 1970-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-05 | 1973-09-04 | 1974-03-06 | $7700.00 | Window Closed / Lapsed |