Patent US4990139A successfully refreshed from Google Patents.
Patent US2777930A successfully refreshed from Google Patents.
US2777930A
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US
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Heating unit
Assignee: Individual
•
Filing: 1954-04-28
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Granted: 1957-01-15
•
Expires: 1974-04-28
Abstract
No abstract record available.
Inventors
- 👤 Nathanson Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:25
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/22; H05B3/26; F; F24; F24D; F24D13/00; F24D13/02; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2512875A
Cited
US1696684A
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US2100327A
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US2205543A
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US2518807A
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US2503457A
Cited
US2598878A
Cited
US2613306A
Cited
US2660659A
Cited
US2641675A
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US2683673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |