US3513828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solar water heater
Assignee: WALTER F MASTERS
•
Filing: 1968-11-04
•
Granted: 1970-05-26
•
Expires: 1988-11-04
Abstract
No abstract record available.
Inventors
- 👤 Walter F Masters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:18
CPC Classifications
F; F24; F24S; F24S10/00; F24S10/50; F24S10/502; F24S10/501; F24S20/00; F24S20/60; F24S20/67; Y; Y02; Y02B; Y02B10/00; Y02B10/20; Y02E; Y02E10/00; Y02E10/40; Y02E10/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3077190A
Cited
US3254643A
Cited
US3146774A
Cited
US3236294A
Cited
US3369539A
Cited
US3387602A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-25 | 1973-11-24 | 1974-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-25 | 1977-11-24 | 1978-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-25 | 1981-11-24 | 1982-05-26 | $7700.00 | Window Closed / Lapsed |