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Patent US3400505A successfully refreshed from Google Patents.
US3400505A
Expired / Lapsed
US
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Window frames
Assignee: SYDNEY CHARLES HART STILL
•
Filing: 1965-09-29
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Granted: 1968-09-10
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Expires: 1985-09-29
Abstract
No abstract record available.
Inventors
- 👤 Hart-Still Sydney Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:42
CPC Classifications
E; E06; E06B; E06B3/00; E06B3/54; E06B3/64
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1787386A
Cited
FR762449A
Cited
US2236812A
Cited
US2304423A
Cited
US2871520A
Cited
US3087207A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-10 | 1972-03-11 | 1972-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-10 | 1976-03-11 | 1976-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-10 | 1980-03-11 | 1980-09-10 | $7700.00 | Window Closed / Lapsed |