Patent US2803090A successfully refreshed from Google Patents.
Patent US3536059A successfully refreshed from Google Patents.
US3536059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical heat source for divers
Assignee: PETER J HEARST
•
Filing: 1968-11-01
•
Granted: 1970-10-27
•
Expires: 1988-11-01
Abstract
No abstract record available.
Inventors
- 👤 Peter J Hearst
- 👤 William B Plum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:46
CPC Classifications
B; B63; B63C; B63C11/00; B63C11/02; B63C11/28; C; C09; C09K; C09K5/00; C09K5/02; C09K5/06; C09K5/063
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-26 | 1974-04-27 | 1974-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-26 | 1978-04-27 | 1978-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-26 | 1982-04-27 | 1982-10-27 | $7700.00 | Window Closed / Lapsed |