US3375795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Panelized furnace roof
Assignee: MH Detrick Co
•
Filing: 1965-06-11
•
Granted: 1968-04-02
•
Expires: 1985-06-11
Abstract
No abstract record available.
Inventors
- 👤 Jr Frank P Merkle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:55
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/02; F27D1/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA537371A
Cited
US1677002A
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US2158759A
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US2699741A
Cited
US2720850A
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AT181284B
Cited
US2982237A
Cited
GB987408A
Cited
GB900175A
Cited
US3129678A
Cited
FR1348731A
Cited
US3198148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-02 | 1971-10-02 | 1972-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-02 | 1975-10-02 | 1976-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-02 | 1979-10-02 | 1980-04-02 | $7700.00 | Window Closed / Lapsed |