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Patent US2989157A successfully refreshed from Google Patents.
US2989157A
Expired / Lapsed
US
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Insulated curtain wall assembly
Assignee: ELWIN G SMITH AND CO Inc
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Filing: 1959-12-21
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Granted: 1961-06-20
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Expires: 1979-12-21
Abstract
No abstract record available.
Inventors
- 👤 Mostoller George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:07
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/88; E04B2/90; E04B2/92
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2674354A
Cited
US2871998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |