US3289409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hiding condensation trails from high altitude aircraft
Assignee: Phillips Petroleum Co
•
Filing: 1964-07-13
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Granted: 1966-12-06
•
Expires: 1984-07-13
Abstract
No abstract record available.
Inventors
- 👤 Robert M Schirmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:46
CPC Classifications
B; B64; B64D; B64D1/00; B64D1/16; B64D1/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
A METHOD OF HIDING CONTRAILS FROM HIGH FLYING AIRCRAFT WHICH COMPRISES INTRODUCING CARBON BLACK INTO THE AIRCRAFT ENGINE EFFLUENT WHILE THE AIRCRAFT IS AT ALTITUDES AT WHICH CONTRAILS OCCUR.
Claim 2
Independent Claim
29 words
A METHOD OF HIDING CONTRAILS FROM HIGH FLYING AIRCRAFT WHICH COMPRISES INTRODUCING CARBON BLACK INTO THE AIRCRAFT ENGINE EFFLUENT WHILE THE AIRCRAFT IS AT ALTITUDES AT WHICH CONTRAILS OCCUR.
References Cited (Backward Citations)
US2232728A
Cited
US2756097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |