Patent US3525850A successfully refreshed from Google Patents.
US3525850A
Expired / Lapsed
US
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High output,quick response,radiant heater
Assignee: Armstrong World Industries Inc
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Filing: 1968-03-15
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Granted: 1970-08-25
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Expires: 1988-03-15
Abstract
No abstract record available.
Inventors
- 👤 Nathaniel E Hager Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:07
CPC Classifications
H; H05; H05B; H05B3/00; H01; H01C; H01C3/00; H01C3/10; H01C3/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB196480A
Cited
US1695860A
Cited
FR975038A
Cited
US2682596A
Cited
US2857499A
Cited
US3327093A
Cited
US3342977A
Cited
US3431705A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-24 | 1974-02-23 | 1974-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-24 | 1978-02-23 | 1978-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-24 | 1982-02-23 | 1982-08-25 | $7700.00 | Window Closed / Lapsed |