Patent US3404031A successfully refreshed from Google Patents.
US3404031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emissive coating
Assignee: Boeing Co
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Filing: 1963-09-03
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Granted: 1968-10-01
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Expires: 1983-09-03
Abstract
No abstract record available.
Inventors
- 👤 Wilson A Clayton
- 👤 Joseph M Gunderson
- 👤 John C Sargent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:59
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/80; C04B41/81; C04B41/85; C09; C09D; C09D1/00
Claims Analysis
Total Claims: 0
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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) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |