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Patent US3381420A successfully refreshed from Google Patents.
US3381420A
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US
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Insulation material
Assignee: Whittaker Corp
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Filing: 1965-04-30
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Granted: 1968-05-07
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Expires: 1985-04-30
Abstract
No abstract record available.
Inventors
- 👤 Brink Norman
- 👤 Holland Herman
- 👤 Robert G Simoneau
- 👤 Yurenka Steven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:06
CPC Classifications
B; B32; B32B; B32B27/00; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/76; E04B1/78; F; F16; F16L; F16L59/00; F16L59/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2819724A
Cited
US3000464A
Cited
US3024941A
Cited
US2996212A
Cited
US3202998A
Cited
US3176933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |