US3464402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solar heat exchanger construction
Assignee: Individual
•
Filing: 1967-09-21
•
Granted: 1969-09-02
•
Expires: 1987-09-21
Abstract
No abstract record available.
Inventors
- 👤 Frank Collura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:25
CPC Classifications
F; F24; F24S; F24S10/00; F24S10/70; F24S10/75; Y; Y02; Y02E; Y02E10/00; Y02E10/40; Y02E10/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1125113A
Cited
US1425174A
Cited
US2257524A
Cited
US2608968A
Cited
US2907318A
Cited
US3039453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-01 | 1973-03-03 | 1973-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-01 | 1977-03-03 | 1977-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-01 | 1981-03-03 | 1981-09-02 | $7700.00 | Window Closed / Lapsed |