US3520521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heavy duty condenser
Assignee: KOMPLEX NAGYBERENDEZESEK EXPORT IMPORT VALLALATA
•
Filing: 1969-01-21
•
Granted: 1970-07-14
•
Expires: 1989-01-21
Abstract
No abstract record available.
Inventors
- 👤 Laszlo Heller
- 👤 Laszlo Forgo
- 👤 Arpad Bakay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:43
CPC Classifications
F; F28; F28B; F28B3/00; F28B3/04; F28B1/00; F28B1/02; F28B9/00; F28B9/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US150478A
Cited
US1372409A
Cited
US1841200A
Cited
US1845549A
Cited
US2308719A
Cited
US2558222A
Cited
US2564583A
Cited
US2689018A
Cited
US2956784A
Cited
US3158666A
Cited
US3391911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |