US3559844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manhole protection ring
Assignee: R GELB AND SONS Inc
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Filing: 1969-06-13
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Granted: 1971-02-02
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Expires: 1989-06-13
Abstract
Abstract A protection ring for a manhole of a glass-lined vessel includes an annular body member and a replaceable impact member releasably secured in a lateral surface recess of the body member.
Inventors
- 👤 Seymour Schlosberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:09
CPC Classifications
B; B65; B65D; B65D90/00; B65D90/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
87 words
A protection ring for a manhole of a glass-lined vessel comprising an annular body member of substantial thickness, a portion of an exposed lateral surface of the body having a recess extending from radially outwardly of an inner peripheral surface of the body to an outer peripheral surface of the body, an impact member releasably secured to the body at the recessed portion of the exposed lateral surface, the impact member being configured to complement the recessed portion, and means for securing the ring to the vessel.
Claim 2
Dependent Claim
87 words
A protection ring for a manhole of a glass-lined vessel comprising an annular body member of substantial thickness, a portion of an exposed lateral surface of the body having a recess extending from radially outwardly of an inner peripheral surface of the body to an outer peripheral surface of the body, an impact member releasably secured to the body at the recessed portion of the exposed lateral surface, the impact member being configured to complement the recessed portion, and means for securing the ring to the vessel.
Claim 3
Dependent Claim
18 words
A manhole protection ring as in claim 1, wherein the body member and impact member are of polytetrafluoroethylene.
Claim 4
Dependent Claim
15 words
A manhole protection ring as in claim 1, wherein the impact member comprises reinforced polytetrafluoroethylene.
Claim 5
Dependent Claim
30 words
A manhole protection ring as in claim 3, wherein the impact member is reinforced with a glass fiber material which comprises approximately 25 percent by weight of the impact member.
Claim 6
Dependent Claim
15 words
A manhole protection ring as in claim 1, wherein the body member comprises reinforced polytetrafluoroethylene.
Claim 7
Dependent Claim
30 words
A manhole protection ring as in claim 5, wherein the body member is reinforced with a glass fiber material which comprises approximately 15 percent by weight of the body member.
Claim 8
Dependent Claim
40 words
A manhole protection ring as in claim 1, wherein the outer peripheral surface has a recess and the means for securing the ring to the vessel include a band releasably secured to the body member in the outer peripheral recess.
Claim 9
Dependent Claim
109 words
In combination with a chemical reactor including inner and outer jackets, a glass lining on the inner jacket surface, and having an annular manhole and a manhole cover, a manhole protection ring comprising an annular body member of substantial thickness, a portion of an exposed lateral surface of the body having a recess extending from radially outwardly of an inner peripheral surface of the body to an outer peripheral surface of the body, an impact member releasably secured to the body at the recessed portion of the exposed lateral surface, the impact member being configured to complement the recessed portion, and means for securing the ring to the vessel.
Claim 10
Dependent Claim
109 words
In combination with a chemical reactor including inner and outer jackets, a glass lining on the inner jacket surface, and having an annular manhole and a manhole cover, a manhole protection ring comprising an annular body member of substantial thickness, a portion of an exposed lateral surface of the body having a recess extending from radially outwardly of an inner peripheral surface of the body to an outer peripheral surface of the body, an impact member releasably secured to the body at the recessed portion of the exposed lateral surface, the impact member being configured to complement the recessed portion, and means for securing the ring to the vessel.
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |