Patent US3390224A successfully refreshed from Google Patents.
US3390224A
Expired / Lapsed
US
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Adjustable underground shell
Assignee: NEW ENGLAND REALTY CO
•
Filing: 1966-09-28
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Granted: 1968-06-25
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Expires: 1986-09-28
Abstract
No abstract record available.
Inventors
- 👤 David L Wyatt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:06
CPC Classifications
H; H02; H02G; H02G9/00; H02G9/10; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/6966; Y10T137/6991; Y10T137/6995; Y10T137/7017
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US407955A
Cited
US1265767A
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US1280388A
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US1408982A
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US1894381A
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US2097394A
Cited
US2100721A
Cited
US3101207A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |