Patent US2800308A successfully refreshed from Google Patents.
US2800308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating system
Assignee: Johns Manville Corp
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Filing: 1946-08-13
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Granted: 1957-07-23
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Expires: 1966-08-13
Abstract
No abstract record available.
Inventors
- 👤 John S Parkinson
- 👤 Rd William A Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:18
CPC Classifications
F; F24; F24D; F24D3/00; F24D3/12; F24D3/16; F24D3/165; E; E04; E04B; E04B9/00; E04B9/22; E04B9/24; E04B9/26; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1800150A
Cited
GB403899A
Cited
AU1671734A
Cited
US2172771A
Cited
US2334484A
Cited
US2382340A
Cited
CH241602A
Cited
US2662746A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-22 | 1961-01-21 | 1961-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-22 | 1965-01-21 | 1965-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-22 | 1969-01-21 | 1969-07-23 | $7700.00 | Window Closed / Lapsed |